66105992 has 8 divisors (see below), whose sum is σ = 123948750. Its totient is φ = 33052992.

The previous prime is 66105989. The next prime is 66106031. The reversal of 66105992 is 29950166.

It can be written as a sum of positive squares in only one way, i.e., 48246916 + 17859076 = 6946^2 + 4226^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4131617 + ... + 4131632.

Almost surely, 2^66105992 is an apocalyptic number.

It is an amenable number.

66105992 is a deficient number, since it is larger than the sum of its proper divisors (57842758).

66105992 is a wasteful number, since it uses less digits than its factorization.

66105992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263255 (or 8263251 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 66105992 is about 8130.5591443639. The cubic root of 66105992 is about 404.3402192446.

The spelling of 66105992 in words is "sixty-six million, one hundred five thousand, nine hundred ninety-two".