667601138 has 32 divisors (see below), whose sum is σ = 1086009600. Its totient is φ = 306716544.

The previous prime is 667601093. The next prime is 667601149. The reversal of 667601138 is 831106766.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642023 + ... + 643061.

It is an arithmetic number, because the mean of its divisors is an integer number (33937800).

Almost surely, 2^667601138 is an apocalyptic number.

667601138 is a deficient number, since it is larger than the sum of its proper divisors (418408462).

667601138 is a wasteful number, since it uses less digits than its factorization.

667601138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 667601138 is about 25837.9785974058. The cubic root of 667601138 is about 873.9884421249.

The spelling of 667601138 in words is "six hundred sixty-seven million, six hundred one thousand, one hundred thirty-eight".