668783412530 has 32 divisors (see below), whose sum is σ = 1220632561584. Its totient is φ = 263777043456.

The previous prime is 668783412511. The next prime is 668783412533. The reversal of 668783412530 is 35214387866.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 207893138209 + 460890274321 = 455953^2 + 678889^2 .

It is a super-2 number, since 2×668783412530² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668783412533) 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, 2602382 + ... + 2847798.

Almost surely, 2^668783412530 is an apocalyptic number.

668783412530 is a deficient number, since it is larger than the sum of its proper divisors (551849149054).

668783412530 is a wasteful number, since it uses less digits than its factorization.

668783412530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249230.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 668783412530 in words is "six hundred sixty-eight billion, seven hundred eighty-three million, four hundred twelve thousand, five hundred thirty".