649204055823 has 32 divisors (see below), whose sum is σ = 914710026240. Its totient is φ = 408430844640.

The previous prime is 649204055761. The next prime is 649204055893. The reversal of 649204055823 is 328550402946.

It is a happy number.

It is a Cunningham number, because it is equal to 805732²-1.

It is not a de Polignac number, because 649204055823 - 2²⁶ = 649136946959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649204055893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15287686 + ... + 15330092.

It is an arithmetic number, because the mean of its divisors is an integer number (28584688320).

Almost surely, 2^649204055823 is an apocalyptic number.

649204055823 is a deficient number, since it is larger than the sum of its proper divisors (265505970417).

649204055823 is a wasteful number, since it uses less digits than its factorization.

649204055823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43467.

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 649204055823 in words is "six hundred forty-nine billion, two hundred four million, fifty-five thousand, eight hundred twenty-three".