2161256574 has 32 divisors (see below), whose sum is σ = 4696796160. Its totient is φ = 660484800.

The previous prime is 2161256551. The next prime is 2161256579. The reversal of 2161256574 is 4756521612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161256579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302247 + ... + 309314.

It is an arithmetic number, because the mean of its divisors is an integer number (146774880).

Almost surely, 2^2161256574 is an apocalyptic number.

2161256574 is an abundant number, since it is smaller than the sum of its proper divisors (2535539586).

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

2161256574 is a wasteful number, since it uses less digits than its factorization.

2161256574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611616.

The product of its digits is 100800, while the sum is 39.

The square root of 2161256574 is about 46489.3167727812. The cubic root of 2161256574 is about 1292.9114327058.

The spelling of 2161256574 in words is "two billion, one hundred sixty-one million, two hundred fifty-six thousand, five hundred seventy-four".