668903535 has 16 divisors (see below), whose sum is σ = 1189162080. Its totient is φ = 356748480.

The previous prime is 668903509. The next prime is 668903537. The reversal of 668903535 is 535309866.

It is not a de Polignac number, because 668903535 - 2¹⁵ = 668870767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668903537) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2477286 + ... + 2477555.

It is an arithmetic number, because the mean of its divisors is an integer number (74322630).

Almost surely, 2^668903535 is an apocalyptic number.

668903535 is a deficient number, since it is larger than the sum of its proper divisors (520258545).

668903535 is a wasteful number, since it uses less digits than its factorization.

668903535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954855 (or 4954849 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The square root of 668903535 is about 25863.1694693439. The cubic root of 668903535 is about 874.5564162504.

The spelling of 668903535 in words is "six hundred sixty-eight million, nine hundred three thousand, five hundred thirty-five".