666627505726666 has 48 divisors (see below), whose sum is σ = 1112368324413024. Its totient is φ = 299357158100000.

The previous prime is 666627505726649. The next prime is 666627505726681.

666627505726666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×666627505726666² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666627505726592 and 666627505726601.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1542007041 + ... + 1542439291.

It is an arithmetic number, because the mean of its divisors is an integer number (23174340091938).

Almost surely, 2^{666627505726666} is an apocalyptic number.

666627505726666 is a deficient number, since it is larger than the sum of its proper divisors (445740818686358).

666627505726666 is a wasteful number, since it uses less digits than its factorization.

666627505726666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509139 (or 509128 counting only the distinct ones).

The product of its (nonzero) digits is 8230118400, while the sum is 76.

The spelling of 666627505726666 in words is "six hundred sixty-six trillion, six hundred twenty-seven billion, five hundred five million, seven hundred twenty-six thousand, six hundred sixty-six".