66976607 has 4 divisors (see below), whose sum is σ = 67014240. Its totient is φ = 66938976.

The previous prime is 66976603. The next prime is 66976619. The reversal of 66976607 is 70667966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66976607 - 2² = 66976603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16007 + ... + 19752.

It is an arithmetic number, because the mean of its divisors is an integer number (16753560).

Almost surely, 2^66976607 is an apocalyptic number.

66976607 is a deficient number, since it is larger than the sum of its proper divisors (37633).

66976607 is a wasteful number, since it uses less digits than its factorization.

66976607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37632.

The product of its (nonzero) digits is 571536, while the sum is 47.

The square root of 66976607 is about 8183.9236922151. The cubic root of 66976607 is about 406.1075349925.

The spelling of 66976607 in words is "sixty-six million, nine hundred seventy-six thousand, six hundred seven".