667865731000 has 64 divisors (see below), whose sum is σ = 1683021674880. Its totient is φ = 246596572800.

The previous prime is 667865730953. The next prime is 667865731051. The reversal of 667865731000 is 137568766.

It is a super-2 number, since 2×667865731000² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 25674144 + ... + 25700143.

It is an arithmetic number, because the mean of its divisors is an integer number (26297213670).

Almost surely, 2^667865731000 is an apocalyptic number.

It is an amenable number.

667865731000 is an abundant number, since it is smaller than the sum of its proper divisors (1015155943880).

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

667865731000 is a wasteful number, since it uses less digits than its factorization.

667865731000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51374321 (or 51374307 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 667865731000 in words is "six hundred sixty-seven billion, eight hundred sixty-five million, seven hundred thirty-one thousand".