1649761656 has 16 divisors (see below), whose sum is σ = 4124404200. Its totient is φ = 549920544.

The previous prime is 1649761613. The next prime is 1649761691. The reversal of 1649761656 is 6561679461.

It is a junction number, because it is equal to n+sod(n) for n = 1649761599 and 1649761608.

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, 34370011 + ... + 34370058.

Almost surely, 2^1649761656 is an apocalyptic number.

It is an amenable number.

1649761656 is an abundant number, since it is smaller than the sum of its proper divisors (2474642544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1649761656 is a wasteful number, since it uses less digits than its factorization.

1649761656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68740078 (or 68740074 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The square root of 1649761656 is about 40617.2581053916. The cubic root of 1649761656 is about 1181.6088501637.

The spelling of 1649761656 in words is "one billion, six hundred forty-nine million, seven hundred sixty-one thousand, six hundred fifty-six".