66772523 has 4 divisors (see below), whose sum is σ = 66816288. Its totient is φ = 66728760.

The previous prime is 66772501. The next prime is 66772553. The reversal of 66772523 is 32527766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66772523 - 2¹⁶ = 66706987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66772553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19508 + ... + 22673.

It is an arithmetic number, because the mean of its divisors is an integer number (16704072).

Almost surely, 2^66772523 is an apocalyptic number.

66772523 is a deficient number, since it is larger than the sum of its proper divisors (43765).

66772523 is a wasteful number, since it uses less digits than its factorization.

66772523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43764.

The product of its digits is 105840, while the sum is 38.

The square root of 66772523 is about 8171.4455881441. The cubic root of 66772523 is about 405.6946327481.

The spelling of 66772523 in words is "sixty-six million, seven hundred seventy-two thousand, five hundred twenty-three".