636700667 has 4 divisors (see below), whose sum is σ = 643004736. Its totient is φ = 630396600.

The previous prime is 636700663. The next prime is 636700709. The reversal of 636700667 is 766007636.

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 636700667 - 2² = 636700663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636700663) 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, 3151883 + ... + 3152084.

It is an arithmetic number, because the mean of its divisors is an integer number (160751184).

Almost surely, 2^636700667 is an apocalyptic number.

636700667 is a deficient number, since it is larger than the sum of its proper divisors (6304069).

636700667 is a wasteful number, since it uses less digits than its factorization.

636700667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6304068.

The product of its (nonzero) digits is 190512, while the sum is 41.

The square root of 636700667 is about 25232.9282288045. The cubic root of 636700667 is about 860.2904494882.

The spelling of 636700667 in words is "six hundred thirty-six million, seven hundred thousand, six hundred sixty-seven".