668663235 has 16 divisors (see below), whose sum is σ = 1188734880. Its totient is φ = 356620320.

The previous prime is 668663221. The next prime is 668663239. The reversal of 668663235 is 532366866.

668663235 is a `hidden beast` number, since 6 + 6 + 8 + 6 + 632 + 3 + 5 = 666.

It is not a de Polignac number, because 668663235 - 2¹² = 668659139 is a prime.

It is a super-2 number, since 2×668663235² = 894221043681330450, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (668663239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2476396 + ... + 2476665.

It is an arithmetic number, because the mean of its divisors is an integer number (74295930).

Almost surely, 2^668663235 is an apocalyptic number.

668663235 is a deficient number, since it is larger than the sum of its proper divisors (520071645).

668663235 is a wasteful number, since it uses less digits than its factorization.

668663235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4953075 (or 4953069 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 668663235 is about 25858.5234497254. The cubic root of 668663235 is about 874.4516771430.

The spelling of 668663235 in words is "six hundred sixty-eight million, six hundred sixty-three thousand, two hundred thirty-five".