2161665750 has 32 divisors (see below), whose sum is σ = 5395519584. Its totient is φ = 576444000.

The previous prime is 2161665683. The next prime is 2161665773. The reversal of 2161665750 is 575661612.

It is a junction number, because it is equal to n+sod(n) for n = 2161665699 and 2161665708.

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, 1440361 + ... + 1441860.

It is an arithmetic number, because the mean of its divisors is an integer number (168609987).

Almost surely, 2^2161665750 is an apocalyptic number.

2161665750 is an abundant number, since it is smaller than the sum of its proper divisors (3233853834).

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

2161665750 is a wasteful number, since it uses less digits than its factorization.

2161665750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882241 (or 2882231 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 2161665750 is about 46493.7173175043. The cubic root of 2161665750 is about 1292.9930202650.

The spelling of 2161665750 in words is "two billion, one hundred sixty-one million, six hundred sixty-five thousand, seven hundred fifty".