81400965552 has 100 divisors (see below), whose sum is σ = 241965666976. Its totient is φ = 26400297600.

The previous prime is 81400965521. The next prime is 81400965577. The reversal of 81400965552 is 25556900418.

81400965552 is a `hidden beast` number, since 8 + 1 + 4 + 0 + 0 + 96 + 5 + 552 = 666.

It is a super-2 number, since 2×81400965552² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81400965498 and 81400965507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 800824 + ... + 896727.

Almost surely, 2^81400965552 is an apocalyptic number.

It is an amenable number.

81400965552 is an abundant number, since it is smaller than the sum of its proper divisors (160564701424).

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

81400965552 is a wasteful number, since it uses less digits than its factorization.

81400965552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697608 (or 1697593 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 81400965552 in words is "eighty-one billion, four hundred million, nine hundred sixty-five thousand, five hundred fifty-two".