651449267040 has 576 divisors, whose sum is σ = 2572019448768. Its totient is φ = 137200926720.

The previous prime is 651449267017. The next prime is 651449267069. The reversal of 651449267040 is 40762944156.

It is a happy number.

It is a super-2 number, since 2×651449267040² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12810304 + ... + 12861056.

It is an arithmetic number, because the mean of its divisors is an integer number (4465311543).

Almost surely, 2^651449267040 is an apocalyptic number.

651449267040 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 651449267040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1286009724384).

651449267040 is an abundant number, since it is smaller than the sum of its proper divisors (1920570181728).

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

651449267040 is a wasteful number, since it uses less digits than its factorization.

651449267040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50823 (or 50804 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 651449267040 in words is "six hundred fifty-one billion, four hundred forty-nine million, two hundred sixty-seven thousand, forty".