667661292 has 60 divisors (see below), whose sum is σ = 1837278520. Its totient is φ = 210838464.

The previous prime is 667661249. The next prime is 667661327. The reversal of 667661292 is 292166766.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48073 + ... + 60384.

Almost surely, 2^667661292 is an apocalyptic number.

It is an amenable number.

667661292 is an abundant number, since it is smaller than the sum of its proper divisors (1169617228).

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

667661292 is a wasteful number, since it uses less digits than its factorization.

667661292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108492 (or 108481 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 667661292 is about 25839.1426328352. The cubic root of 667661292 is about 874.0146914918.

The spelling of 667661292 in words is "six hundred sixty-seven million, six hundred sixty-one thousand, two hundred ninety-two".