66172753 has 2 divisors, whose sum is σ = 66172754. Its totient is φ = 66172752.

The previous prime is 66172741. The next prime is 66172907. The reversal of 66172753 is 35727166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64448784 + 1723969 = 8028^2 + 1313^2 .

It is a cyclic number.

It is not a de Polignac number, because 66172753 - 2²⁵ = 32618321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66172153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33086376 + 33086377.

It is an arithmetic number, because the mean of its divisors is an integer number (33086377).

Almost surely, 2^66172753 is an apocalyptic number.

It is an amenable number.

66172753 is a deficient number, since it is larger than the sum of its proper divisors (1).

66172753 is an equidigital number, since it uses as much as digits as its factorization.

66172753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The square root of 66172753 is about 8134.6636685237. The cubic root of 66172753 is about 404.4762889837.

The spelling of 66172753 in words is "sixty-six million, one hundred seventy-two thousand, seven hundred fifty-three".