66976651 has 16 divisors (see below), whose sum is σ = 81487296. Its totient is φ = 53738496.

The previous prime is 66976639. The next prime is 66976669. The reversal of 66976651 is 15667966.

It is not a de Polignac number, because 66976651 - 2⁵ = 66976619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66976681) 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, 22015 + ... + 24871.

It is an arithmetic number, because the mean of its divisors is an integer number (5092956).

Almost surely, 2^66976651 is an apocalyptic number.

66976651 is a deficient number, since it is larger than the sum of its proper divisors (14510645).

66976651 is a wasteful number, since it uses less digits than its factorization.

66976651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078.

The product of its digits is 408240, while the sum is 46.

The square root of 66976651 is about 8183.9263804118. The cubic root of 66976651 is about 406.1076239227.

The spelling of 66976651 in words is "sixty-six million, nine hundred seventy-six thousand, six hundred fifty-one".