668150866987 has 4 divisors (see below), whose sum is σ = 668278454976. Its totient is φ = 668023279000.

The previous prime is 668150866973. The next prime is 668150866991. The reversal of 668150866987 is 789668051866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668150866987 - 2¹¹ = 668150864939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668150866927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63786139 + ... + 63796612.

It is an arithmetic number, because the mean of its divisors is an integer number (167069613744).

Almost surely, 2^668150866987 is an apocalyptic number.

668150866987 is a deficient number, since it is larger than the sum of its proper divisors (127587989).

668150866987 is a wasteful number, since it uses less digits than its factorization.

668150866987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127587988.

The product of its (nonzero) digits is 209018880, while the sum is 70.

The spelling of 668150866987 in words is "six hundred sixty-eight billion, one hundred fifty million, eight hundred sixty-six thousand, nine hundred eighty-seven".