66695964 has 24 divisors (see below), whose sum is σ = 164778768. Its totient is φ = 20924160.

The previous prime is 66695963. The next prime is 66695983. The reversal of 66695964 is 46959666.

It is a super-2 number, since 2×66695964² = 8896703227778592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66695963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163267 + ... + 163674.

It is an arithmetic number, because the mean of its divisors is an integer number (6865782).

Almost surely, 2^66695964 is an apocalyptic number.

It is an amenable number.

66695964 is an abundant number, since it is smaller than the sum of its proper divisors (98082804).

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

66695964 is a wasteful number, since it uses less digits than its factorization.

66695964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326965 (or 326963 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 51.

The square root of 66695964 is about 8166.7597001504. The cubic root of 66695964 is about 405.5395217725.

It can be divided in two parts, 6 and 6695964, that added together give a triangular number (6695970 = T₃₆₅₉).

The spelling of 66695964 in words is "sixty-six million, six hundred ninety-five thousand, nine hundred sixty-four".