649789403936 has 12 divisors (see below), whose sum is σ = 1279272889062. Its totient is φ = 324894701952.

The previous prime is 649789403881. The next prime is 649789403957. The reversal of 649789403936 is 639304987946.

It is a happy number.

649789403936 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 586517032336 + 63272371600 = 765844^2 + 251540^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152959405 + ... + 10152959468.

Almost surely, 2^649789403936 is an apocalyptic number.

It is an amenable number.

649789403936 is a deficient number, since it is larger than the sum of its proper divisors (629483485126).

649789403936 is a wasteful number, since it uses less digits than its factorization.

649789403936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20305918883 (or 20305918875 counting only the distinct ones).

The product of its (nonzero) digits is 211631616, while the sum is 68.

The spelling of 649789403936 in words is "six hundred forty-nine billion, seven hundred eighty-nine million, four hundred three thousand, nine hundred thirty-six".