668358535 has 16 divisors (see below), whose sum is σ = 909185760. Its totient is φ = 467579520.

The previous prime is 668358443. The next prime is 668358539. The reversal of 668358535 is 535853866.

It is a happy number.

It is not a de Polignac number, because 668358535 - 2¹¹ = 668356487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668358539) 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, 269356 + ... + 271825.

It is an arithmetic number, because the mean of its divisors is an integer number (56824110).

Almost surely, 2^668358535 is an apocalyptic number.

668358535 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

668358535 is a deficient number, since it is larger than the sum of its proper divisors (240827225).

668358535 is a wasteful number, since it uses less digits than its factorization.

668358535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541218.

The product of its digits is 2592000, while the sum is 49.

The square root of 668358535 is about 25852.6311040095. The cubic root of 668358535 is about 874.3188320404.

The spelling of 668358535 in words is "six hundred sixty-eight million, three hundred fifty-eight thousand, five hundred thirty-five".