1650640656 has 240 divisors, whose sum is σ = 5349062400. Its totient is φ = 435891456.

The previous prime is 1650640643. The next prime is 1650640661. The reversal of 1650640656 is 6560460561.

It is a super-2 number, since 2×1650640656² = 5449229150480220672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1921155 + ... + 1922013.

It is an arithmetic number, because the mean of its divisors is an integer number (22287760).

Almost surely, 2^1650640656 is an apocalyptic number.

1650640656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1650640656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674531200).

1650640656 is an abundant number, since it is smaller than the sum of its proper divisors (3698421744).

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

1650640656 is a wasteful number, since it uses less digits than its factorization.

1650640656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1650640656 is about 40628.0771880728. The cubic root of 1650640656 is about 1181.8186683046.

The spelling of 1650640656 in words is "one billion, six hundred fifty million, six hundred forty thousand, six hundred fifty-six".