667166531 has 8 divisors (see below), whose sum is σ = 690209664. Its totient is φ = 644218560.

The previous prime is 667166527. The next prime is 667166561. The reversal of 667166531 is 135661766.

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 667166531 - 2² = 667166527 is a prime.

It is a super-2 number, since 2×667166531² = 890222360173147922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667166561) 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, 9380 + ... + 37713.

It is an arithmetic number, because the mean of its divisors is an integer number (86276208).

Almost surely, 2^667166531 is an apocalyptic number.

667166531 is a deficient number, since it is larger than the sum of its proper divisors (23043133).

667166531 is a wasteful number, since it uses less digits than its factorization.

667166531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47581.

The product of its digits is 136080, while the sum is 41.

The square root of 667166531 is about 25829.5669921120. The cubic root of 667166531 is about 873.7987460482.

The spelling of 667166531 in words is "six hundred sixty-seven million, one hundred sixty-six thousand, five hundred thirty-one".