641151561420 has 144 divisors (see below), whose sum is σ = 1956455810400. Its totient is φ = 169952256000.

The previous prime is 641151561419. The next prime is 641151561431. The reversal of 641151561420 is 24165151146.

641151561420 is a `hidden beast` number, since 6 + 4 + 1 + 1 + 5 + 15 + 614 + 20 = 666.

It is a super-2 number, since 2×641151561420² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133543020 + ... + 133547820.

Almost surely, 2^641151561420 is an apocalyptic number.

641151561420 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 641151561420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978227905200).

641151561420 is an abundant number, since it is smaller than the sum of its proper divisors (1315304248980).

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

641151561420 is a wasteful number, since it uses less digits than its factorization.

641151561420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096 (or 9091 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 641151561420 in words is "six hundred forty-one billion, one hundred fifty-one million, five hundred sixty-one thousand, four hundred twenty".