649512165779 has 8 divisors (see below), whose sum is σ = 687750508368. Its totient is φ = 611277350400.

The previous prime is 649512165769. The next prime is 649512165793. The reversal of 649512165779 is 977561215946.

It is a happy number.

649512165779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649512165779 - 2²⁸ = 649243730323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649512165739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497897 + ... + 1243754.

It is an arithmetic number, because the mean of its divisors is an integer number (85968813546).

Almost surely, 2^649512165779 is an apocalyptic number.

649512165779 is a deficient number, since it is larger than the sum of its proper divisors (38238342589).

649512165779 is a wasteful number, since it uses less digits than its factorization.

649512165779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763605.

The product of its digits is 28576800, while the sum is 62.

The spelling of 649512165779 in words is "six hundred forty-nine billion, five hundred twelve million, one hundred sixty-five thousand, seven hundred seventy-nine".