66666532831 has 8 divisors (see below), whose sum is σ = 66910498704. Its totient is φ = 66422865600.

The previous prime is 66666532819. The next prime is 66666532871. The reversal of 66666532831 is 13823566666.

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 66666532831 - 2⁵ = 66666532799 is a prime.

It is a super-2 number, since 2×66666532831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666532871) 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, 377611 + ... + 525283.

It is an arithmetic number, because the mean of its divisors is an integer number (8363812338).

Almost surely, 2^66666532831 is an apocalyptic number.

66666532831 is a deficient number, since it is larger than the sum of its proper divisors (243965873).

66666532831 is a wasteful number, since it uses less digits than its factorization.

66666532831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149321.

The product of its digits is 5598720, while the sum is 52.

The spelling of 66666532831 in words is "sixty-six billion, six hundred sixty-six million, five hundred thirty-two thousand, eight hundred thirty-one".