667023699 has 4 divisors (see below), whose sum is σ = 889364936. Its totient is φ = 444682464.

The previous prime is 667023691. The next prime is 667023739. The reversal of 667023699 is 996320766.

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

It is not a de Polignac number, because 667023699 - 2³ = 667023691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667023691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111170614 + ... + 111170619.

It is an arithmetic number, because the mean of its divisors is an integer number (222341234).

Almost surely, 2^667023699 is an apocalyptic number.

667023699 is a deficient number, since it is larger than the sum of its proper divisors (222341237).

667023699 is a wasteful number, since it uses less digits than its factorization.

667023699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222341236.

The product of its (nonzero) digits is 734832, while the sum is 48.

The square root of 667023699 is about 25826.8019506868. The cubic root of 667023699 is about 873.7363851411.

The spelling of 667023699 in words is "six hundred sixty-seven million, twenty-three thousand, six hundred ninety-nine".