649678812558 has 16 divisors (see below), whose sum is σ = 1299937981440. Its totient is φ = 216462878136.

The previous prime is 649678812491. The next prime is 649678812569. The reversal of 649678812558 is 855218876946.

It is a junction number, because it is equal to n+sod(n) for n = 649678812492 and 649678812501.

It is a congruent number.

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, 24166960 + ... + 24193827.

It is an arithmetic number, because the mean of its divisors is an integer number (81246123840).

Almost surely, 2^649678812558 is an apocalyptic number.

649678812558 is an abundant number, since it is smaller than the sum of its proper divisors (650259168882).

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

649678812558 is a wasteful number, since it uses less digits than its factorization.

649678812558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48363031.

The product of its digits is 232243200, while the sum is 69.

The spelling of 649678812558 in words is "six hundred forty-nine billion, six hundred seventy-eight million, eight hundred twelve thousand, five hundred fifty-eight".