2191669960 has 16 divisors (see below), whose sum is σ = 4931257500. Its totient is φ = 876667968.

The previous prime is 2191669933. The next prime is 2191669973. The reversal of 2191669960 is 699661912.

It can be written as a sum of positive squares in 2 ways, for example, as 2107360836 + 84309124 = 45906^2 + 9182^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27395835 + ... + 27395914.

Almost surely, 2^2191669960 is an apocalyptic number.

2191669960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191669960 is an abundant number, since it is smaller than the sum of its proper divisors (2739587540).

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

2191669960 is a wasteful number, since it uses less digits than its factorization.

2191669960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54791760 (or 54791756 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 2191669960 is about 46815.2748576787. The cubic root of 2191669960 is about 1298.9478587495.

The spelling of 2191669960 in words is "two billion, one hundred ninety-one million, six hundred sixty-nine thousand, nine hundred sixty".