66631366 has 16 divisors (see below), whose sum is σ = 106781760. Its totient is φ = 31089960.

The previous prime is 66631343. The next prime is 66631379. The reversal of 66631366 is 66313666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10540 + ... + 15631.

It is an arithmetic number, because the mean of its divisors is an integer number (6673860).

Almost surely, 2^66631366 is an apocalyptic number.

66631366 is a deficient number, since it is larger than the sum of its proper divisors (40150394).

66631366 is a wasteful number, since it uses less digits than its factorization.

66631366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26259.

The product of its digits is 69984, while the sum is 37.

The square root of 66631366 is about 8162.8038075161. The cubic root of 66631366 is about 405.4085518073.

The spelling of 66631366 in words is "sixty-six million, six hundred thirty-one thousand, three hundred sixty-six".