2161620552 has 64 divisors (see below), whose sum is σ = 6651146880. Its totient is φ = 570097152.

The previous prime is 2161620497. The next prime is 2161620599. The reversal of 2161620552 is 2550261612.

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, 492693 + ... + 497060.

It is an arithmetic number, because the mean of its divisors is an integer number (103924170).

Almost surely, 2^2161620552 is an apocalyptic number.

It is an amenable number.

2161620552 is an abundant number, since it is smaller than the sum of its proper divisors (4489526328).

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

2161620552 is a wasteful number, since it uses less digits than its factorization.

2161620552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989782 (or 989778 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 2161620552 is about 46493.2312492905. The cubic root of 2161620552 is about 1292.9840085255.

The spelling of 2161620552 in words is "two billion, one hundred sixty-one million, six hundred twenty thousand, five hundred fifty-two".