66798531 has 12 divisors (see below), whose sum is σ = 97927752. Its totient is φ = 43867296.

The previous prime is 66798527. The next prime is 66798533. The reversal of 66798531 is 13589766.

It is a happy number.

It is not a de Polignac number, because 66798531 - 2² = 66798527 is a prime.

It is a super-2 number, since 2×66798531² = 8924087487515922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66798533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54786 + ... + 55991.

It is an arithmetic number, because the mean of its divisors is an integer number (8160646).

Almost surely, 2^66798531 is an apocalyptic number.

66798531 is a deficient number, since it is larger than the sum of its proper divisors (31129221).

66798531 is a wasteful number, since it uses less digits than its factorization.

66798531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110850 (or 110847 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 66798531 is about 8173.0368284989. The cubic root of 66798531 is about 405.7472988045.

The spelling of 66798531 in words is "sixty-six million, seven hundred ninety-eight thousand, five hundred thirty-one".