667685507988 has 24 divisors (see below), whose sum is σ = 1558983421408. Its totient is φ = 222411754656.

The previous prime is 667685507977. The next prime is 667685507999. The reversal of 667685507988 is 889705586766.

It is an interprime number because it is at equal distance from previous prime (667685507977) and next prime (667685507999).

It is a super-2 number, since 2×667685507988² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 18741631 + ... + 18777222.

Almost surely, 2^667685507988 is an apocalyptic number.

It is an amenable number.

667685507988 is an abundant number, since it is smaller than the sum of its proper divisors (891297913420).

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

667685507988 is a wasteful number, since it uses less digits than its factorization.

667685507988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37520343 (or 37520341 counting only the distinct ones).

The product of its (nonzero) digits is 1219276800, while the sum is 75.

The spelling of 667685507988 in words is "six hundred sixty-seven billion, six hundred eighty-five million, five hundred seven thousand, nine hundred eighty-eight".