660721663113 has 16 divisors (see below), whose sum is σ = 922402373760. Its totient is φ = 419891757824.

The previous prime is 660721663097. The next prime is 660721663157. The reversal of 660721663113 is 311366127066.

It is a cyclic number.

It is not a de Polignac number, because 660721663113 - 2⁴ = 660721663097 is a prime.

It is a super-2 number, since 2×660721663113² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660721663193) 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, 16320528 + ... + 16360961.

It is an arithmetic number, because the mean of its divisors is an integer number (57650148360).

Almost surely, 2^660721663113 is an apocalyptic number.

It is an amenable number.

660721663113 is a deficient number, since it is larger than the sum of its proper divisors (261680710647).

660721663113 is a wasteful number, since it uses less digits than its factorization.

660721663113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32681808.

The product of its (nonzero) digits is 163296, while the sum is 42.

The spelling of 660721663113 in words is "six hundred sixty billion, seven hundred twenty-one million, six hundred sixty-three thousand, one hundred thirteen".