648864433898 has 16 divisors (see below), whose sum is σ = 1019389432320. Its totient is φ = 309172832496.

The previous prime is 648864433859. The next prime is 648864433907. The reversal of 648864433898 is 898334468846.

648864433898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×648864433898² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26206490 + ... + 26231237.

It is an arithmetic number, because the mean of its divisors is an integer number (63711839520).

Almost surely, 2^648864433898 is an apocalyptic number.

648864433898 is a deficient number, since it is larger than the sum of its proper divisors (370524998422).

648864433898 is a wasteful number, since it uses less digits than its factorization.

648864433898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52438021.

The product of its digits is 764411904, while the sum is 71.

The spelling of 648864433898 in words is "six hundred forty-eight billion, eight hundred sixty-four million, four hundred thirty-three thousand, eight hundred ninety-eight".