66212164 has 6 divisors (see below), whose sum is σ = 115871294. Its totient is φ = 33106080.

The previous prime is 66212149. The next prime is 66212177. The reversal of 66212164 is 46121266.

It can be written as a sum of positive squares in only one way, i.e., 46922500 + 19289664 = 6850^2 + 4392^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8276517 + ... + 8276524.

Almost surely, 2^66212164 is an apocalyptic number.

It is an amenable number.

66212164 is a deficient number, since it is larger than the sum of its proper divisors (49659130).

66212164 is a wasteful number, since it uses less digits than its factorization.

66212164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16553045 (or 16553043 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 66212164 is about 8137.0857191012. The cubic root of 66212164 is about 404.5565720342.

The spelling of 66212164 in words is "sixty-six million, two hundred twelve thousand, one hundred sixty-four".