2161557750 has 64 divisors (see below), whose sum is σ = 5885747712. Its totient is φ = 524012000.

The previous prime is 2161557709. The next prime is 2161557763. The reversal of 2161557750 is 577551612.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2161557699 and 2161557708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122754 + ... + 139253.

It is an arithmetic number, because the mean of its divisors is an integer number (91964808).

Almost surely, 2^2161557750 is an apocalyptic number.

2161557750 is an abundant number, since it is smaller than the sum of its proper divisors (3724189962).

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

2161557750 is a wasteful number, since it uses less digits than its factorization.

2161557750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262038 (or 262028 counting only the distinct ones).

The product of its (nonzero) digits is 73500, while the sum is 39.

The square root of 2161557750 is about 46492.5558557496. Note that the first 3 decimals coincide. The cubic root of 2161557750 is about 1292.9714866287.

The spelling of 2161557750 in words is "two billion, one hundred sixty-one million, five hundred fifty-seven thousand, seven hundred fifty".