81523245902 has 32 divisors (see below), whose sum is σ = 141053724864. Its totient is φ = 34613913600.

The previous prime is 81523245899. The next prime is 81523245917. The reversal of 81523245902 is 20954232518.

It is a self number, because there is not a number n which added to its sum of digits gives 81523245902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3978002 + ... + 3998442.

It is an arithmetic number, because the mean of its divisors is an integer number (4407928902).

Almost surely, 2^81523245902 is an apocalyptic number.

81523245902 is a deficient number, since it is larger than the sum of its proper divisors (59530478962).

81523245902 is a wasteful number, since it uses less digits than its factorization.

81523245902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23084.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 81523245902 in words is "eighty-one billion, five hundred twenty-three million, two hundred forty-five thousand, nine hundred two".