667998668 has 24 divisors (see below), whose sum is σ = 1175441904. Its totient is φ = 332164800.

The previous prime is 667998659. The next prime is 667998671. The reversal of 667998668 is 866899766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010258 + ... + 1010918.

It is an arithmetic number, because the mean of its divisors is an integer number (48976746).

Almost surely, 2^667998668 is an apocalyptic number.

It is an amenable number.

667998668 is a deficient number, since it is larger than the sum of its proper divisors (507443236).

667998668 is a wasteful number, since it uses less digits than its factorization.

667998668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673 (or 1671 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 65.

The square root of 667998668 is about 25845.6701983137. The cubic root of 667998668 is about 874.1618828551.

The spelling of 667998668 in words is "six hundred sixty-seven million, nine hundred ninety-eight thousand, six hundred sixty-eight".