668911459357 has 4 divisors (see below), whose sum is σ = 668915908636. Its totient is φ = 668907010080.

The previous prime is 668911459331. The next prime is 668911459423. The reversal of 668911459357 is 753954119866.

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

It can be written as a sum of positive squares in 2 ways, for example, as 263516928921 + 405394530436 = 513339^2 + 636706^2 .

It is a cyclic number.

It is not a de Polignac number, because 668911459357 - 2²³ = 668903070749 is a prime.

It is a super-2 number, since 2×668911459357² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668911459327) 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, 1990944 + ... + 2302537.

It is an arithmetic number, because the mean of its divisors is an integer number (167228977159).

Almost surely, 2^668911459357 is an apocalyptic number.

It is an amenable number.

668911459357 is a deficient number, since it is larger than the sum of its proper divisors (4449279).

668911459357 is a wasteful number, since it uses less digits than its factorization.

668911459357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4449278.

The product of its digits is 48988800, while the sum is 64.

The spelling of 668911459357 in words is "six hundred sixty-eight billion, nine hundred eleven million, four hundred fifty-nine thousand, three hundred fifty-seven".