66336651 has 20 divisors (see below), whose sum is σ = 100128952. Its totient is φ = 43763328.

The previous prime is 66336643. The next prime is 66336661. The reversal of 66336651 is 15663366.

It is a happy number.

It is not a de Polignac number, because 66336651 - 2³ = 66336643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66336631) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3636 + ... + 12078.

Almost surely, 2^66336651 is an apocalyptic number.

66336651 is a deficient number, since it is larger than the sum of its proper divisors (33792301).

66336651 is an equidigital number, since it uses as much as digits as its factorization.

66336651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552 (or 8543 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 66336651 is about 8144.7314872867. The cubic root of 66336651 is about 404.8099519854.

The spelling of 66336651 in words is "sixty-six million, three hundred thirty-six thousand, six hundred fifty-one".