667634542 has 8 divisors (see below), whose sum is σ = 1001614896. Its totient is φ = 333762912.

The previous prime is 667634533. The next prime is 667634551. The reversal of 667634542 is 245436766.

It is an interprime number because it is at equal distance from previous prime (667634533) and next prime (667634551).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9538 + ... + 37765.

It is an arithmetic number, because the mean of its divisors is an integer number (125201862).

Almost surely, 2^667634542 is an apocalyptic number.

667634542 is a deficient number, since it is larger than the sum of its proper divisors (333980354).

667634542 is a wasteful number, since it uses less digits than its factorization.

667634542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54362.

The product of its digits is 725760, while the sum is 43.

The square root of 667634542 is about 25838.6250021165. The cubic root of 667634542 is about 874.0030188041.

It can be divided in two parts, 667 and 634542, that added together give a square (635209 = 797²).

The spelling of 667634542 in words is "six hundred sixty-seven million, six hundred thirty-four thousand, five hundred forty-two".