649919455 has 4 divisors (see below), whose sum is σ = 779903352. Its totient is φ = 519935560.

The previous prime is 649919449. The next prime is 649919477. The reversal of 649919455 is 554919946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 649919455 - 2³ = 649919447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64991941 + ... + 64991950.

It is an arithmetic number, because the mean of its divisors is an integer number (194975838).

Almost surely, 2^649919455 is an apocalyptic number.

649919455 is a deficient number, since it is larger than the sum of its proper divisors (129983897).

649919455 is a wasteful number, since it uses less digits than its factorization.

649919455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129983896.

The product of its digits is 1749600, while the sum is 52.

The square root of 649919455 is about 25493.5179016157. The cubic root of 649919455 is about 866.2033237456.

The spelling of 649919455 in words is "six hundred forty-nine million, nine hundred nineteen thousand, four hundred fifty-five".