666475254531 has 12 divisors (see below), whose sum is σ = 963145146600. Its totient is φ = 444105143520.

The previous prime is 666475254527. The next prime is 666475254539. The reversal of 666475254531 is 135452574666.

It is not a de Polignac number, because 666475254531 - 2² = 666475254527 is a prime.

It is a super-2 number, since 2×666475254531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666475254539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17621130 + ... + 17658911.

It is an arithmetic number, because the mean of its divisors is an integer number (80262095550).

Almost surely, 2^666475254531 is an apocalyptic number.

666475254531 is a deficient number, since it is larger than the sum of its proper divisors (296669892069).

666475254531 is a wasteful number, since it uses less digits than its factorization.

666475254531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35282146 (or 35282143 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 54.

The spelling of 666475254531 in words is "six hundred sixty-six billion, four hundred seventy-five million, two hundred fifty-four thousand, five hundred thirty-one".