649172117942 has 16 divisors (see below), whose sum is σ = 975644331264. Its totient is φ = 323957448000.

The previous prime is 649172117933. The next prime is 649172117959. The reversal of 649172117942 is 249711271946.

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, 17684267 + ... + 17720937.

It is an arithmetic number, because the mean of its divisors is an integer number (60977770704).

Almost surely, 2^649172117942 is an apocalyptic number.

649172117942 is a deficient number, since it is larger than the sum of its proper divisors (326472213322).

649172117942 is a wasteful number, since it uses less digits than its factorization.

649172117942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53575.

The product of its digits is 1524096, while the sum is 53.

The spelling of 649172117942 in words is "six hundred forty-nine billion, one hundred seventy-two million, one hundred seventeen thousand, nine hundred forty-two".