81386904304774 has 4 divisors (see below), whose sum is σ = 122080356457164. Its totient is φ = 40693452152386.

The previous prime is 81386904304763. The next prime is 81386904304807. The reversal of 81386904304774 is 47740340968318.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20346726076192 + ... + 20346726076195.

It is an arithmetic number, because the mean of its divisors is an integer number (30520089114291).

Almost surely, 2^{81386904304774} is an apocalyptic number.

81386904304774 is a deficient number, since it is larger than the sum of its proper divisors (40693452152390).

81386904304774 is a wasteful number, since it uses less digits than its factorization.

81386904304774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40693452152389.

The product of its (nonzero) digits is 97542144, while the sum is 64.

The spelling of 81386904304774 in words is "eighty-one trillion, three hundred eighty-six billion, nine hundred four million, three hundred four thousand, seven hundred seventy-four".