648858761 has 2 divisors, whose sum is σ = 648858762. Its totient is φ = 648858760.

The previous prime is 648858757. The next prime is 648858779. The reversal of 648858761 is 167858846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645414025 + 3444736 = 25405^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 648858761 - 2² = 648858757 is a prime.

It is not a weakly prime, because it can be changed into another prime (648858461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324429380 + 324429381.

It is an arithmetic number, because the mean of its divisors is an integer number (324429381).

Almost surely, 2^648858761 is an apocalyptic number.

It is an amenable number.

648858761 is a deficient number, since it is larger than the sum of its proper divisors (1).

648858761 is an equidigital number, since it uses as much as digits as its factorization.

648858761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2580480, while the sum is 53.

The square root of 648858761 is about 25472.7061970259. The cubic root of 648858761 is about 865.7318412455.

The spelling of 648858761 in words is "six hundred forty-eight million, eight hundred fifty-eight thousand, seven hundred sixty-one".