66976655 has 8 divisors (see below), whose sum is σ = 80635632. Its totient is φ = 53405568.

The previous prime is 66976639. The next prime is 66976669. The reversal of 66976655 is 55667966.

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 66976655 - 2⁴ = 66976639 is a prime.

It is a Duffinian number.

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, 20282 + ... + 23351.

It is an arithmetic number, because the mean of its divisors is an integer number (10079454).

Almost surely, 2^66976655 is an apocalyptic number.

66976655 is a deficient number, since it is larger than the sum of its proper divisors (13658977).

66976655 is a wasteful number, since it uses less digits than its factorization.

66976655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43945.

The product of its digits is 2041200, while the sum is 50.

The square root of 66976655 is about 8183.9266247933. The cubic root of 66976655 is about 406.1076320073.

The spelling of 66976655 in words is "sixty-six million, nine hundred seventy-six thousand, six hundred fifty-five".