81465212374 has 16 divisors (see below), whose sum is σ = 150397315488. Its totient is φ = 32227996032.

The previous prime is 81465212363. The next prime is 81465212393. The reversal of 81465212374 is 47321256418.

It is a self number, because there is not a number n which added to its sum of digits gives 81465212374.

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, 223805347 + ... + 223805710.

It is an arithmetic number, because the mean of its divisors is an integer number (9399832218).

Almost surely, 2^81465212374 is an apocalyptic number.

81465212374 is a deficient number, since it is larger than the sum of its proper divisors (68932103114).

81465212374 is a wasteful number, since it uses less digits than its factorization.

81465212374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447611079.

The product of its digits is 322560, while the sum is 43.

The spelling of 81465212374 in words is "eighty-one billion, four hundred sixty-five million, two hundred twelve thousand, three hundred seventy-four".