2159405668 has 24 divisors (see below), whose sum is σ = 4319848512. Its totient is φ = 925237344.

The previous prime is 2159405653. The next prime is 2159405683. The reversal of 2159405668 is 8665049512.

It is an interprime number because it is at equal distance from previous prime (2159405653) and next prime (2159405683).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170946 + ... + 183142.

It is an arithmetic number, because the mean of its divisors is an integer number (179993688).

Almost surely, 2^2159405668 is an apocalyptic number.

2159405668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2159405668 is an abundant number, since it is smaller than the sum of its proper divisors (2160442844).

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

2159405668 is a wasteful number, since it uses less digits than its factorization.

2159405668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18531 (or 18529 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 2159405668 is about 46469.4057203231. The cubic root of 2159405668 is about 1292.5422430065.

The spelling of 2159405668 in words is "two billion, one hundred fifty-nine million, four hundred five thousand, six hundred sixty-eight".