81495252504 has 192 divisors, whose sum is σ = 248990227200. Its totient is φ = 23950764288.

The previous prime is 81495252497. The next prime is 81495252529. The reversal of 81495252504 is 40525259418.

81495252504 is a `hidden beast` number, since 8 + 1 + 4 + 95 + 2 + 52 + 504 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81495252504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1129167 + ... + 1199169.

It is an arithmetic number, because the mean of its divisors is an integer number (1296824100).

Almost surely, 2^81495252504 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 81495252504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124495113600).

81495252504 is an abundant number, since it is smaller than the sum of its proper divisors (167494974696).

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

81495252504 is a wasteful number, since it uses less digits than its factorization.

81495252504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70094 (or 70087 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 81495252504 in words is "eighty-one billion, four hundred ninety-five million, two hundred fifty-two thousand, five hundred four".