6451444156620 has 96 divisors (see below), whose sum is σ = 18200905507008. Its totient is φ = 1707357560832.

The previous prime is 6451444156613. The next prime is 6451444156627. The reversal of 6451444156620 is 266514441546.

It is an interprime number because it is at equal distance from previous prime (6451444156613) and next prime (6451444156627).

It is a super-2 number, since 2×6451444156620² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6451444156620.

It is not an unprimeable number, because it can be changed into a prime (6451444156627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30283194 + ... + 30495486.

It is an arithmetic number, because the mean of its divisors is an integer number (189592765698).

Almost surely, 2^{6451444156620} is an apocalyptic number.

6451444156620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6451444156620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9100452753504).

6451444156620 is an abundant number, since it is smaller than the sum of its proper divisors (11749461350388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6451444156620 is a wasteful number, since it uses less digits than its factorization.

6451444156620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216139 (or 216137 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 6451444156620 in words is "six trillion, four hundred fifty-one billion, four hundred forty-four million, one hundred fifty-six thousand, six hundred twenty".