2161587968 has 18 divisors (see below), whose sum is σ = 4314732744. Its totient is φ = 1080793856.

The previous prime is 2161587943. The next prime is 2161587979. The reversal of 2161587968 is 8697851612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4221596 + ... + 4222107.

Almost surely, 2^2161587968 is an apocalyptic number.

It is an amenable number.

2161587968 is a deficient number, since it is larger than the sum of its proper divisors (2153144776).

2161587968 is an frugal number, since it uses more digits than its factorization.

2161587968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443719 (or 8443705 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 53.

The square root of 2161587968 is about 46492.8808313703. The cubic root of 2161587968 is about 1292.9775117327.

The spelling of 2161587968 in words is "two billion, one hundred sixty-one million, five hundred eighty-seven thousand, nine hundred sixty-eight".