81554770922 has 32 divisors (see below), whose sum is σ = 134340539904. Its totient is φ = 36964569600.

The previous prime is 81554770907. The next prime is 81554770931. The reversal of 81554770922 is 22907745518.

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, 39038 + ... + 405750.

It is an arithmetic number, because the mean of its divisors is an integer number (4198141872).

Almost surely, 2^81554770922 is an apocalyptic number.

81554770922 is a deficient number, since it is larger than the sum of its proper divisors (52785768982).

81554770922 is a wasteful number, since it uses less digits than its factorization.

81554770922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366974.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 81554770922 in words is "eighty-one billion, five hundred fifty-four million, seven hundred seventy thousand, nine hundred twenty-two".