648458687261 has 16 divisors (see below), whose sum is σ = 812934665088. Its totient is φ = 502500801600.

The previous prime is 648458687257. The next prime is 648458687273. The reversal of 648458687261 is 162786854846.

It is not a de Polignac number, because 648458687261 - 2² = 648458687257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648458687221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23249990 + ... + 23277863.

It is an arithmetic number, because the mean of its divisors is an integer number (50808416568).

Almost surely, 2^648458687261 is an apocalyptic number.

It is an amenable number.

648458687261 is a deficient number, since it is larger than the sum of its proper divisors (164475977827).

648458687261 is a wasteful number, since it uses less digits than its factorization.

648458687261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46528052.

The product of its digits is 123863040, while the sum is 65.

The spelling of 648458687261 in words is "six hundred forty-eight billion, four hundred fifty-eight million, six hundred eighty-seven thousand, two hundred sixty-one".