646027720627 has 2 divisors, whose sum is σ = 646027720628. Its totient is φ = 646027720626.

The previous prime is 646027720609. The next prime is 646027720649. The reversal of 646027720627 is 726027720646.

646027720627 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646027720627 is a prime.

It is a super-2 number, since 2×646027720627² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646027720427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323013860313 + 323013860314.

It is an arithmetic number, because the mean of its divisors is an integer number (323013860314).

Almost surely, 2^646027720627 is an apocalyptic number.

646027720627 is a deficient number, since it is larger than the sum of its proper divisors (1).

646027720627 is an equidigital number, since it uses as much as digits as its factorization.

646027720627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 49.

The spelling of 646027720627 in words is "six hundred forty-six billion, twenty-seven million, seven hundred twenty thousand, six hundred twenty-seven".