81383912374 has 32 divisors (see below), whose sum is σ = 128252880000. Its totient is φ = 38679548544.

The previous prime is 81383912327. The next prime is 81383912383. The reversal of 81383912374 is 47321938318.

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, 1573672 + ... + 1624564.

It is an arithmetic number, because the mean of its divisors is an integer number (4007902500).

Almost surely, 2^81383912374 is an apocalyptic number.

81383912374 is a deficient number, since it is larger than the sum of its proper divisors (46868967626).

81383912374 is a wasteful number, since it uses less digits than its factorization.

81383912374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51352.

The product of its digits is 870912, while the sum is 49.

The spelling of 81383912374 in words is "eighty-one billion, three hundred eighty-three million, nine hundred twelve thousand, three hundred seventy-four".