648623663 has 2 divisors, whose sum is σ = 648623664. Its totient is φ = 648623662.

The previous prime is 648623659. The next prime is 648623681. The reversal of 648623663 is 366326846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648623663 - 2² = 648623659 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648623683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324311831 + 324311832.

It is an arithmetic number, because the mean of its divisors is an integer number (324311832).

Almost surely, 2^648623663 is an apocalyptic number.

648623663 is a deficient number, since it is larger than the sum of its proper divisors (1).

648623663 is an equidigital number, since it uses as much as digits as its factorization.

648623663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 44.

The square root of 648623663 is about 25468.0910749118. The cubic root of 648623663 is about 865.6272697408.

The spelling of 648623663 in words is "six hundred forty-eight million, six hundred twenty-three thousand, six hundred sixty-three".