667511493 has 16 divisors (see below), whose sum is σ = 971360256. Its totient is φ = 404371440.

The previous prime is 667511483. The next prime is 667511567. The reversal of 667511493 is 394115766.

It is not a de Polignac number, because 667511493 - 2⁵ = 667511461 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667511483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130380 + ... + 135402.

It is an arithmetic number, because the mean of its divisors is an integer number (60710016).

Almost surely, 2^667511493 is an apocalyptic number.

It is an amenable number.

667511493 is a deficient number, since it is larger than the sum of its proper divisors (303848763).

667511493 is a wasteful number, since it uses less digits than its factorization.

667511493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9064.

The product of its digits is 136080, while the sum is 42.

The square root of 667511493 is about 25836.2437865879. The cubic root of 667511493 is about 873.9493208609.

The spelling of 667511493 in words is "six hundred sixty-seven million, five hundred eleven thousand, four hundred ninety-three".