666261893913 has 64 divisors (see below), whose sum is σ = 1155914993664. Its totient is φ = 331002144000.

The previous prime is 666261893903. The next prime is 666261893923. The reversal of 666261893913 is 319398162666.

It is an interprime number because it is at equal distance from previous prime (666261893903) and next prime (666261893923).

It is not a de Polignac number, because 666261893913 - 2¹⁸ = 666261631769 is a prime.

It is a super-2 number, since 2×666261893913² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666261893903) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51960043 + ... + 51972863.

It is an arithmetic number, because the mean of its divisors is an integer number (18061171776).

Almost surely, 2^666261893913 is an apocalyptic number.

It is an amenable number.

666261893913 is a deficient number, since it is larger than the sum of its proper divisors (489653099751).

666261893913 is a wasteful number, since it uses less digits than its factorization.

666261893913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22646.

The product of its digits is 15116544, while the sum is 60.

The spelling of 666261893913 in words is "six hundred sixty-six billion, two hundred sixty-one million, eight hundred ninety-three thousand, nine hundred thirteen".