661600631546657 has 8 divisors (see below), whose sum is σ = 721746721346112. Its totient is φ = 601454638054000.

The previous prime is 661600631546653. The next prime is 661600631546669. The reversal of 661600631546657 is 756645136006166.

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 661600631546657 - 2² = 661600631546653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661600631546657.

It is not an unprimeable number, because it can be changed into a prime (661600631546653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9319469 + ... + 37550682.

It is an arithmetic number, because the mean of its divisors is an integer number (90218340168264).

Almost surely, 2^{661600631546657} is an apocalyptic number.

It is an amenable number.

661600631546657 is a deficient number, since it is larger than the sum of its proper divisors (60146089799455).

661600631546657 is a wasteful number, since it uses less digits than its factorization.

661600631546657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48153399.

The product of its (nonzero) digits is 97977600, while the sum is 62.

The spelling of 661600631546657 in words is "six hundred sixty-one trillion, six hundred billion, six hundred thirty-one million, five hundred forty-six thousand, six hundred fifty-seven".