66952749841156 has 81 divisors (see below), whose sum is σ = 123142040261877. Its totient is φ = 31850739852960.

The previous prime is 66952749841067. The next prime is 66952749841189. The reversal of 66952749841156 is 65114894725966.

The square root of 66952749841156 is 8182466.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 35108397954756 + 31844351886400 = 5925234^2 + 5643080^2 .

It is a super-2 number, since 2×66952749841156² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 33695393995 + ... + 33695395981.

Almost surely, 2^{66952749841156} is an apocalyptic number.

66952749841156 is the 8182466-th square number.

It is an amenable number.

66952749841156 is a deficient number, since it is larger than the sum of its proper divisors (56189290420721).

66952749841156 is an frugal number, since it uses more digits than its factorization.

66952749841156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178 (or 2089 counting only the distinct ones).

The product of its digits is 783820800, while the sum is 73.

The spelling of 66952749841156 in words is "sixty-six trillion, nine hundred fifty-two billion, seven hundred forty-nine million, eight hundred forty-one thousand, one hundred fifty-six".