648706566 has 16 divisors (see below), whose sum is σ = 1310010624. Its totient is φ = 214135944.

The previous prime is 648706523. The next prime is 648706567. The reversal of 648706566 is 665607846.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648706567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524226 + ... + 525461.

It is an arithmetic number, because the mean of its divisors is an integer number (81875664).

Almost surely, 2^648706566 is an apocalyptic number.

648706566 is an abundant number, since it is smaller than the sum of its proper divisors (661304058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648706566 is a wasteful number, since it uses less digits than its factorization.

648706566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049795.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The square root of 648706566 is about 25469.7186085752. The cubic root of 648706566 is about 865.6641478487.

The spelling of 648706566 in words is "six hundred forty-eight million, seven hundred six thousand, five hundred sixty-six".