66817922 has 16 divisors (see below), whose sum is σ = 107580312. Its totient is φ = 31011840.

The previous prime is 66817909. The next prime is 66817979. The reversal of 66817922 is 22971866.

It can be written as a sum of positive squares in 4 ways, for example, as 65302561 + 1515361 = 8081^2 + 1231^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66817922.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10979 + ... + 15942.

Almost surely, 2^66817922 is an apocalyptic number.

66817922 is a deficient number, since it is larger than the sum of its proper divisors (40762390).

66817922 is a wasteful number, since it uses less digits than its factorization.

66817922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27013.

The product of its digits is 72576, while the sum is 41.

The square root of 66817922 is about 8174.2230211807. The cubic root of 66817922 is about 405.7865565774.

The spelling of 66817922 in words is "sixty-six million, eight hundred seventeen thousand, nine hundred twenty-two".