648261018 has 12 divisors (see below), whose sum is σ = 1404565578. Its totient is φ = 216087000.

The previous prime is 648260993. The next prime is 648261043. The reversal of 648261018 is 810162846.

648261018 is a `hidden beast` number, since 648 + 2 + 6 + 1 + 0 + 1 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (648260993) and next prime (648261043).

It can be written as a sum of positive squares in only one way, i.e., 329531409 + 318729609 = 18153^2 + 17853^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18007233 + ... + 18007268.

Almost surely, 2^648261018 is an apocalyptic number.

648261018 is an abundant number, since it is smaller than the sum of its proper divisors (756304560).

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

648261018 is a wasteful number, since it uses less digits than its factorization.

648261018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36014509 (or 36014506 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 648261018 is about 25460.9704842530. The cubic root of 648261018 is about 865.4659158153.

The spelling of 648261018 in words is "six hundred forty-eight million, two hundred sixty-one thousand, eighteen".