81107751257400 has 192 divisors, whose sum is σ = 288091878796800. Its totient is φ = 18491256322560.

The previous prime is 81107751257371. The next prime is 81107751257443. The reversal of 81107751257400 is 475215770118.

It is a self number, because there is not a number n which added to its sum of digits gives 81107751257400.

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 47 ways as a sum of consecutive naturals, for example, 23188012 + ... + 26455611.

It is an arithmetic number, because the mean of its divisors is an integer number (1500478535400).

Almost surely, 2^{81107751257400} is an apocalyptic number.

It is an amenable number.

81107751257400 is an abundant number, since it is smaller than the sum of its proper divisors (206984127539400).

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

81107751257400 is a wasteful number, since it uses less digits than its factorization.

81107751257400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49644038 (or 49644029 counting only the distinct ones).

The product of its (nonzero) digits is 548800, while the sum is 48.

The spelling of 81107751257400 in words is "eighty-one trillion, one hundred seven billion, seven hundred fifty-one million, two hundred fifty-seven thousand, four hundred".