66375957 has 4 divisors (see below), whose sum is σ = 88501280. Its totient is φ = 44250636.

The previous prime is 66375943. The next prime is 66375977. The reversal of 66375957 is 75957366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66375957 - 2⁴ = 66375941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66375917) 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, 11062657 + ... + 11062662.

It is an arithmetic number, because the mean of its divisors is an integer number (22125320).

Almost surely, 2^66375957 is an apocalyptic number.

It is an amenable number.

66375957 is a deficient number, since it is larger than the sum of its proper divisors (22125323).

66375957 is a wasteful number, since it uses less digits than its factorization.

66375957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22125322.

The product of its digits is 1190700, while the sum is 48.

The square root of 66375957 is about 8147.1441008491. The cubic root of 66375957 is about 404.8898892856.

The spelling of 66375957 in words is "sixty-six million, three hundred seventy-five thousand, nine hundred fifty-seven".