81615002448 has 40 divisors (see below), whose sum is σ = 240958579648. Its totient is φ = 23318572032.

The previous prime is 81615002429. The next prime is 81615002461. The reversal of 81615002448 is 84420051618.

It is a super-2 number, since 2×81615002448² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121450561 + ... + 121451232.

Almost surely, 2^81615002448 is an apocalyptic number.

It is an amenable number.

81615002448 is an abundant number, since it is smaller than the sum of its proper divisors (159343577200).

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

81615002448 is a wasteful number, since it uses less digits than its factorization.

81615002448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242901811 (or 242901805 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The spelling of 81615002448 in words is "eighty-one billion, six hundred fifteen million, two thousand, four hundred forty-eight".