81347481474 has 32 divisors (see below), whose sum is σ = 190472155776. Its totient is φ = 22675255680.

The previous prime is 81347481461. The next prime is 81347481503. The reversal of 81347481474 is 47418474318.

It is a happy 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, 23618337 + ... + 23621780.

It is an arithmetic number, because the mean of its divisors is an integer number (5952254868).

Almost surely, 2^81347481474 is an apocalyptic number.

81347481474 is an abundant number, since it is smaller than the sum of its proper divisors (109124674302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81347481474 is a wasteful number, since it uses less digits than its factorization.

81347481474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47240170.

The product of its digits is 2408448, while the sum is 51.

The spelling of 81347481474 in words is "eighty-one billion, three hundred forty-seven million, four hundred eighty-one thousand, four hundred seventy-four".