666620490627 has 32 divisors (see below), whose sum is σ = 1215490357760. Its totient is φ = 351623993760.

The previous prime is 666620490623. The next prime is 666620490631. The reversal of 666620490627 is 726094026666.

It is an interprime number because it is at equal distance from previous prime (666620490623) and next prime (666620490631).

It is not a de Polignac number, because 666620490627 - 2² = 666620490623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666620490623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135654949 + ... + 135659862.

It is an arithmetic number, because the mean of its divisors is an integer number (37984073680).

Almost surely, 2^666620490627 is an apocalyptic number.

666620490627 is a deficient number, since it is larger than the sum of its proper divisors (548869867133).

666620490627 is a wasteful number, since it uses less digits than its factorization.

666620490627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271314840 (or 271314834 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 666620490627 in words is "six hundred sixty-six billion, six hundred twenty million, four hundred ninety thousand, six hundred twenty-seven".