66474531 has 24 divisors (see below), whose sum is σ = 101627136. Its totient is φ = 41783280.

The previous prime is 66474523. The next prime is 66474547. The reversal of 66474531 is 13547466.

It is a happy number.

66474531 is a `hidden beast` number, since 6 + 647 + 4 + 5 + 3 + 1 = 666.

It is not a de Polignac number, because 66474531 - 2³ = 66474523 is a prime.

It is a super-2 number, since 2×66474531² = 8837726543339922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66474511) 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, 12436 + ... + 16958.

It is an arithmetic number, because the mean of its divisors is an integer number (4234464).

Almost surely, 2^66474531 is an apocalyptic number.

66474531 is a deficient number, since it is larger than the sum of its proper divisors (35152605).

66474531 is a wasteful number, since it uses less digits than its factorization.

66474531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623 (or 4620 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 66474531 is about 8153.1914610170. The cubic root of 66474531 is about 405.0902222407.

The spelling of 66474531 in words is "sixty-six million, four hundred seventy-four thousand, five hundred thirty-one".