665151627231 has 64 divisors (see below), whose sum is σ = 1213060172800. Its totient is φ = 350777443968.

The previous prime is 665151627211. The next prime is 665151627293. The reversal of 665151627231 is 132726151566.

665151627231 is a `hidden beast` number, since 6 + 6 + 5 + 15 + 1 + 627 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 665151627231 - 2¹³ = 665151619039 is a prime.

It is a super-3 number, since 3×665151627231³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665151627211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13289505 + ... + 13339461.

It is an arithmetic number, because the mean of its divisors is an integer number (18954065200).

Almost surely, 2^665151627231 is an apocalyptic number.

665151627231 is a deficient number, since it is larger than the sum of its proper divisors (547908545569).

665151627231 is a wasteful number, since it uses less digits than its factorization.

665151627231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55405 (or 55399 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

Adding to 665151627231 its reverse (132726151566), we get a palindrome (797877778797).

The spelling of 665151627231 in words is "six hundred sixty-five billion, one hundred fifty-one million, six hundred twenty-seven thousand, two hundred thirty-one".