648646693 has 2 divisors, whose sum is σ = 648646694. Its totient is φ = 648646692.

The previous prime is 648646673. The next prime is 648646711. The reversal of 648646693 is 396646846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508863364 + 139783329 = 22558^2 + 11823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648646693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648646693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648646633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324323346 + 324323347.

It is an arithmetic number, because the mean of its divisors is an integer number (324323347).

Almost surely, 2^648646693 is an apocalyptic number.

It is an amenable number.

648646693 is a deficient number, since it is larger than the sum of its proper divisors (1).

648646693 is an equidigital number, since it uses as much as digits as its factorization.

648646693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 52.

The square root of 648646693 is about 25468.5432052954. The cubic root of 648646693 is about 865.6375145927.

The spelling of 648646693 in words is "six hundred forty-eight million, six hundred forty-six thousand, six hundred ninety-three".