501668887 has 4 divisors (see below), whose sum is σ = 503768160. Its totient is φ = 499569616.

The previous prime is 501668879. The next prime is 501668891. The reversal of 501668887 is 788866105.

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 501668887 - 2³ = 501668879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501668887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501668807) 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, 1049278 + ... + 1049755.

It is an arithmetic number, because the mean of its divisors is an integer number (125942040).

Almost surely, 2^501668887 is an apocalyptic number.

501668887 is a deficient number, since it is larger than the sum of its proper divisors (2099273).

501668887 is a wasteful number, since it uses less digits than its factorization.

501668887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099272.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 501668887 is about 22397.9661353436. The cubic root of 501668887 is about 794.5826096387.

The spelling of 501668887 in words is "five hundred one million, six hundred sixty-eight thousand, eight hundred eighty-seven".