66764651 has 8 divisors (see below), whose sum is σ = 70387200. Its totient is φ = 63153000.

The previous prime is 66764647. The next prime is 66764671. The reversal of 66764651 is 15646766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66764651 - 2² = 66764647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66764599 and 66764608.

It is not an unprimeable number, because it can be changed into a prime (66764671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11930 + ... + 16608.

It is an arithmetic number, because the mean of its divisors is an integer number (8798400).

Almost surely, 2^66764651 is an apocalyptic number.

66764651 is a deficient number, since it is larger than the sum of its proper divisors (3622549).

66764651 is a wasteful number, since it uses less digits than its factorization.

66764651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5449.

The product of its digits is 181440, while the sum is 41.

The square root of 66764651 is about 8170.9638966281. The cubic root of 66764651 is about 405.6786892955.

The spelling of 66764651 in words is "sixty-six million, seven hundred sixty-four thousand, six hundred fifty-one".