2081791656 has 72 divisors (see below), whose sum is σ = 6558716970. Its totient is φ = 594796608.

The previous prime is 2081791603. The next prime is 2081791667. The reversal of 2081791656 is 6561971802.

It can be written as a sum of positive squares in only one way, i.e., 1683789156 + 398002500 = 41034^2 + 19950^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 291511 + ... + 298566.

Almost surely, 2^2081791656 is an apocalyptic number.

It is an amenable number.

2081791656 is an abundant number, since it is smaller than the sum of its proper divisors (4476925314).

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

2081791656 is a wasteful number, since it uses less digits than its factorization.

2081791656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590103 (or 590089 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 2081791656 is about 45626.6551042261. The cubic root of 2081791656 is about 1276.8672690782.

The spelling of 2081791656 in words is "two billion, eighty-one million, seven hundred ninety-one thousand, six hundred fifty-six".