66231275 has 12 divisors (see below), whose sum is σ = 89593224. Its totient is φ = 48168000.

The previous prime is 66231271. The next prime is 66231281. The reversal of 66231275 is 57213266.

It is not a de Polignac number, because 66231275 - 2² = 66231271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66231271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120146 + ... + 120695.

It is an arithmetic number, because the mean of its divisors is an integer number (7466102).

Almost surely, 2^66231275 is an apocalyptic number.

66231275 is a deficient number, since it is larger than the sum of its proper divisors (23361949).

66231275 is a wasteful number, since it uses less digits than its factorization.

66231275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240862 (or 240857 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 66231275 is about 8138.2599491538. The cubic root of 66231275 is about 404.5954910507.

Subtracting from 66231275 its reverse (57213266), we obtain a square (9018009 = 3003²).

The spelling of 66231275 in words is "sixty-six million, two hundred thirty-one thousand, two hundred seventy-five".