66412251531 has 48 divisors (see below), whose sum is σ = 104151528000. Its totient is φ = 40652510976.

The previous prime is 66412251517. The next prime is 66412251611. The reversal of 66412251531 is 13515221466.

66412251531 is a `hidden beast` number, since 6 + 64 + 12 + 2 + 51 + 531 = 666.

It is not a de Polignac number, because 66412251531 - 2⁹ = 66412251019 is a prime.

It is a super-2 number, since 2×66412251531² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66412252531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1006545 + ... + 1070493.

It is an arithmetic number, because the mean of its divisors is an integer number (2169823500).

Almost surely, 2^66412251531 is an apocalyptic number.

66412251531 is a deficient number, since it is larger than the sum of its proper divisors (37739276469).

66412251531 is a wasteful number, since it uses less digits than its factorization.

66412251531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64180 (or 64177 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

Adding to 66412251531 its reverse (13515221466), we get a palindrome (79927472997).

The spelling of 66412251531 in words is "sixty-six billion, four hundred twelve million, two hundred fifty-one thousand, five hundred thirty-one".