66871497 has 24 divisors (see below), whose sum is σ = 112009408. Its totient is φ = 34737120.

The previous prime is 66871463. The next prime is 66871499. The reversal of 66871497 is 79417866.

It is not a de Polignac number, because 66871497 - 2¹² = 66867401 is a prime.

It is a super-2 number, since 2×66871497² = 8943594222042018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66871499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10618 + ... + 15699.

Almost surely, 2^66871497 is an apocalyptic number.

It is an amenable number.

66871497 is a deficient number, since it is larger than the sum of its proper divisors (45137911).

66871497 is a wasteful number, since it uses less digits than its factorization.

66871497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26349 (or 26338 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The square root of 66871497 is about 8177.4994344237. The cubic root of 66871497 is about 405.8949816141.

The spelling of 66871497 in words is "sixty-six million, eight hundred seventy-one thousand, four hundred ninety-seven".