651521136440 has 32 divisors (see below), whose sum is σ = 1473289020000. Its totient is φ = 259298861184.

The previous prime is 651521136403. The next prime is 651521136499. The reversal of 651521136440 is 44631125156.

It is a junction number, because it is equal to n+sod(n) for n = 651521136394 and 651521136403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40916735 + ... + 40932654.

It is an arithmetic number, because the mean of its divisors is an integer number (46040281875).

Almost surely, 2^651521136440 is an apocalyptic number.

It is an amenable number.

651521136440 is an abundant number, since it is smaller than the sum of its proper divisors (821767883560).

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

651521136440 is a wasteful number, since it uses less digits than its factorization.

651521136440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81849599 (or 81849595 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 651521136440 in words is "six hundred fifty-one billion, five hundred twenty-one million, one hundred thirty-six thousand, four hundred forty".