2157883665 has 32 divisors (see below), whose sum is σ = 3948307200. Its totient is φ = 985845504.

The previous prime is 2157883639. The next prime is 2157883687. The reversal of 2157883665 is 5663887512.

It is a happy number.

2157883665 is a nontrivial binomial coefficient, being equal to C(65695, 2).

It is not a de Polignac number, because 2157883665 - 2⁷ = 2157883537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191611 + ... + 202559.

It is an arithmetic number, because the mean of its divisors is an integer number (123384600).

Almost surely, 2^2157883665 is an apocalyptic number.

2157883665 is the 65694-th triangular number.

It is an amenable number.

2157883665 is a deficient number, since it is larger than the sum of its proper divisors (1790423535).

2157883665 is a wasteful number, since it uses less digits than its factorization.

2157883665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12841.

The product of its digits is 2419200, while the sum is 51.

The square root of 2157883665 is about 46453.0264353142. The cubic root of 2157883665 is about 1292.2384996245.

It can be divided in two parts, 215788 and 3665, that added together give a triangular number (219453 = T₆₆₂).

The spelling of 2157883665 in words is "two billion, one hundred fifty-seven million, eight hundred eighty-three thousand, six hundred sixty-five".