81180079474 has 32 divisors (see below), whose sum is σ = 134721832896. Its totient is φ = 36444116160.

The previous prime is 81180079441. The next prime is 81180079537. The reversal of 81180079474 is 47497008118.

It is a super-2 number, since 2×81180079474² (a number of 23 digits) contains 22 as substring.

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, 3770889 + ... + 3792355.

It is an arithmetic number, because the mean of its divisors is an integer number (4210057278).

Almost surely, 2^81180079474 is an apocalyptic number.

81180079474 is a deficient number, since it is larger than the sum of its proper divisors (53541753422).

81180079474 is a wasteful number, since it uses less digits than its factorization.

81180079474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25450.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 81180079474 in words is "eighty-one billion, one hundred eighty million, seventy-nine thousand, four hundred seventy-four".