2161677972 has 48 divisors (see below), whose sum is σ = 5117161280. Its totient is φ = 710166528.

The previous prime is 2161677961. The next prime is 2161677989. The reversal of 2161677972 is 2797761612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248163 + ... + 256725.

Almost surely, 2^2161677972 is an apocalyptic number.

It is an amenable number.

2161677972 is an abundant number, since it is smaller than the sum of its proper divisors (2955483308).

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

2161677972 is a wasteful number, since it uses less digits than its factorization.

2161677972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8872 (or 8870 counting only the distinct ones).

The product of its digits is 444528, while the sum is 48.

The square root of 2161677972 is about 46493.8487544320. The cubic root of 2161677972 is about 1292.9954571097.

The spelling of 2161677972 in words is "two billion, one hundred sixty-one million, six hundred seventy-seven thousand, nine hundred seventy-two".