81023416925880 has 1536 divisors, whose sum is σ = 307852412313600. Its totient is φ = 16860507955200.

The previous prime is 81023416925839. The next prime is 81023416925887. The reversal of 81023416925880 is 8852961432018.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 81023416925880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81023416925887) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 92387020002 + ... + 92387020878.

It is an arithmetic number, because the mean of its divisors is an integer number (200424747600).

Almost surely, 2^{81023416925880} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81023416925880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153926206156800).

81023416925880 is an abundant number, since it is smaller than the sum of its proper divisors (226828995387720).

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

81023416925880 is a wasteful number, since it uses less digits than its factorization.

81023416925880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 81023416925880 in words is "eighty-one trillion, twenty-three billion, four hundred sixteen million, nine hundred twenty-five thousand, eight hundred eighty".