661768339113 has 24 divisors (see below), whose sum is σ = 1092506408448. Its totient is φ = 378131378112.

The previous prime is 661768339097. The next prime is 661768339151. The reversal of 661768339113 is 311933867166.

661768339113 is a `hidden beast` number, since 6 + 6 + 176 + 83 + 391 + 1 + 3 = 666.

It is not a de Polignac number, because 661768339113 - 2⁴ = 661768339097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661768339113.

It is not an unprimeable number, because it can be changed into a prime (661768339313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 821320 + ... + 1413542.

It is an arithmetic number, because the mean of its divisors is an integer number (45521100352).

Almost surely, 2^661768339113 is an apocalyptic number.

661768339113 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

661768339113 is a deficient number, since it is larger than the sum of its proper divisors (430738069335).

661768339113 is a wasteful number, since it uses less digits than its factorization.

661768339113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609973 (or 609970 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The spelling of 661768339113 in words is "six hundred sixty-one billion, seven hundred sixty-eight million, three hundred thirty-nine thousand, one hundred thirteen".