668815233965 has 8 divisors (see below), whose sum is σ = 805561844760. Its totient is φ = 533063144512.

The previous prime is 668815233937. The next prime is 668815234049. The reversal of 668815233965 is 569332518866.

It can be written as a sum of positive squares in 4 ways, for example, as 84743285449 + 584071948516 = 291107^2 + 764246^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668815233965 - 2²² = 668811039661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668815233898 and 668815233907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248628854 + ... + 248631543.

It is an arithmetic number, because the mean of its divisors is an integer number (100695230595).

Almost surely, 2^668815233965 is an apocalyptic number.

It is an amenable number.

668815233965 is a deficient number, since it is larger than the sum of its proper divisors (136746610795).

668815233965 is a wasteful number, since it uses less digits than its factorization.

668815233965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497260671.

The product of its digits is 55987200, while the sum is 62.

The spelling of 668815233965 in words is "six hundred sixty-eight billion, eight hundred fifteen million, two hundred thirty-three thousand, nine hundred sixty-five".