66976847 has 4 divisors (see below), whose sum is σ = 76544976. Its totient is φ = 57408720.

The previous prime is 66976829. The next prime is 66976849. The reversal of 66976847 is 74867966.

It is a happy number.

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 66976847 - 2²² = 62782543 is a prime.

It is a super-2 number, since 2×66976847² = 8971796068122818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976849) 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, 4784054 + ... + 4784067.

It is an arithmetic number, because the mean of its divisors is an integer number (19136244).

Almost surely, 2^66976847 is an apocalyptic number.

66976847 is a deficient number, since it is larger than the sum of its proper divisors (9568129).

66976847 is an equidigital number, since it uses as much as digits as its factorization.

66976847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9568128.

The product of its digits is 3048192, while the sum is 53.

The square root of 66976847 is about 8183.9383550953. The cubic root of 66976847 is about 406.1080200658.

The spelling of 66976847 in words is "sixty-six million, nine hundred seventy-six thousand, eight hundred forty-seven".