66631497 has 16 divisors (see below), whose sum is σ = 89994240. Its totient is φ = 43849232.

The previous prime is 66631489. The next prime is 66631549. The reversal of 66631497 is 79413666.

It is a cyclic number.

It is not a de Polignac number, because 66631497 - 2³ = 66631489 is a prime.

It is a super-2 number, since 2×66631497² = 8879512784922018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66631427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89308 + ... + 90050.

It is an arithmetic number, because the mean of its divisors is an integer number (5624640).

Almost surely, 2^66631497 is an apocalyptic number.

It is an amenable number.

66631497 is a deficient number, since it is larger than the sum of its proper divisors (23362743).

66631497 is a wasteful number, since it uses less digits than its factorization.

66631497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092.

The product of its digits is 163296, while the sum is 42.

The square root of 66631497 is about 8162.8118317158. The cubic root of 66631497 is about 405.4088174904.

The spelling of 66631497 in words is "sixty-six million, six hundred thirty-one thousand, four hundred ninety-seven".