1656811680 has 96 divisors (see below), whose sum is σ = 5224673664. Its totient is φ = 441332736.

The previous prime is 1656811631. The next prime is 1656811691. The reversal of 1656811680 is 861186561.

It is a tau number, because it is divible by the number of its divisors (96).

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 15 ways as a sum of consecutive naturals, for example, 739522 + ... + 741758.

It is an arithmetic number, because the mean of its divisors is an integer number (54423684).

Almost surely, 2^1656811680 is an apocalyptic number.

1656811680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656811680 is an abundant number, since it is smaller than the sum of its proper divisors (3567861984).

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

1656811680 is a wasteful number, since it uses less digits than its factorization.

1656811680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3798 (or 3790 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1656811680 is about 40703.9516509147. The cubic root of 1656811680 is about 1183.2896045910.

The spelling of 1656811680 in words is "one billion, six hundred fifty-six million, eight hundred eleven thousand, six hundred eighty".