66312567257 has 8 divisors (see below), whose sum is σ = 66573414336. Its totient is φ = 66051786672.

The previous prime is 66312567173. The next prime is 66312567311. The reversal of 66312567257 is 75276521366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66312567257 - 2²⁸ = 66044131801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66312567857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3155258 + ... + 3176204.

It is an arithmetic number, because the mean of its divisors is an integer number (8321676792).

Almost surely, 2^66312567257 is an apocalyptic number.

It is an amenable number.

66312567257 is a deficient number, since it is larger than the sum of its proper divisors (260847079).

66312567257 is a wasteful number, since it uses less digits than its factorization.

66312567257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33247.

The product of its digits is 3175200, while the sum is 50.

The spelling of 66312567257 in words is "sixty-six billion, three hundred twelve million, five hundred sixty-seven thousand, two hundred fifty-seven".