661315716963 has 24 divisors (see below), whose sum is σ = 1043944205616. Its totient is φ = 400077806400.

The previous prime is 661315716917. The next prime is 661315716967. The reversal of 661315716963 is 369617513166.

It is a happy number.

661315716963 is a `hidden beast` number, since 6 + 6 + 1 + 3 + 1 + 571 + 6 + 9 + 63 = 666.

It is not a de Polignac number, because 661315716963 - 2¹⁴ = 661315700579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661315716967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5941228 + ... + 6051513.

It is an arithmetic number, because the mean of its divisors is an integer number (43497675234).

Almost surely, 2^661315716963 is an apocalyptic number.

661315716963 is a deficient number, since it is larger than the sum of its proper divisors (382628488653).

661315716963 is a wasteful number, since it uses less digits than its factorization.

661315716963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11993315 (or 11993312 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The spelling of 661315716963 in words is "six hundred sixty-one billion, three hundred fifteen million, seven hundred sixteen thousand, nine hundred sixty-three".