666724464427666 has 32 divisors (see below), whose sum is σ = 1010619618287616. Its totient is φ = 329855447880000.

The previous prime is 666724464427639. The next prime is 666724464427729.

666724464427666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×666724464427666² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666724464427592 and 666724464427601.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2096570911 + ... + 2096888893.

It is an arithmetic number, because the mean of its divisors is an integer number (31581863071488).

Almost surely, 2^{666724464427666} is an apocalyptic number.

666724464427666 is a deficient number, since it is larger than the sum of its proper divisors (343895153859950).

666724464427666 is a wasteful number, since it uses less digits than its factorization.

666724464427666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324538.

The product of its digits is 14046068736, while the sum is 76.

The spelling of 666724464427666 in words is "six hundred sixty-six trillion, seven hundred twenty-four billion, four hundred sixty-four million, four hundred twenty-seven thousand, six hundred sixty-six".