667662156 has 96 divisors (see below), whose sum is σ = 1988743680. Its totient is φ = 189749952.

The previous prime is 667662143. The next prime is 667662173. The reversal of 667662156 is 651266766.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146691 + ... + 151173.

It is an arithmetic number, because the mean of its divisors is an integer number (20716080).

Almost surely, 2^667662156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667662156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (994371840).

667662156 is an abundant number, since it is smaller than the sum of its proper divisors (1321081524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667662156 is a wasteful number, since it uses less digits than its factorization.

667662156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700 (or 4692 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 667662156 is about 25839.1593516507. The cubic root of 667662156 is about 874.0150685035.

The spelling of 667662156 in words is "six hundred sixty-seven million, six hundred sixty-two thousand, one hundred fifty-six".