1661650056 has 96 divisors (see below), whose sum is σ = 4920570720. Its totient is φ = 502387200.

The previous prime is 1661650027. The next prime is 1661650139. The reversal of 1661650056 is 6500561661.

It is a super-2 number, since 2×1661650056² = 5522161817209606272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1661650056.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 386736 + ... + 391008.

It is an arithmetic number, because the mean of its divisors is an integer number (51255945).

Almost surely, 2^1661650056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661650056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2460285360).

1661650056 is an abundant number, since it is smaller than the sum of its proper divisors (3258920664).

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

1661650056 is a wasteful number, since it uses less digits than its factorization.

1661650056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4787 (or 4780 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1661650056 is about 40763.3420612197. The cubic root of 1661650056 is about 1184.4403360489.

The spelling of 1661650056 in words is "one billion, six hundred sixty-one million, six hundred fifty thousand, fifty-six".