2161256575 has 12 divisors (see below), whose sum is σ = 2745324288. Its totient is φ = 1686833600.

The previous prime is 2161256551. The next prime is 2161256579. The reversal of 2161256575 is 5756521612.

It is not a de Polignac number, because 2161256575 - 2¹¹ = 2161254527 is a prime.

It is a Duffinian 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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1053247 + ... + 1055296.

It is an arithmetic number, because the mean of its divisors is an integer number (228777024).

Almost surely, 2^2161256575 is an apocalyptic number.

2161256575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2161256575 is a deficient number, since it is larger than the sum of its proper divisors (584067713).

2161256575 is a wasteful number, since it uses less digits than its factorization.

2161256575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108594 (or 2108589 counting only the distinct ones).

The product of its digits is 126000, while the sum is 40.

The square root of 2161256575 is about 46489.3167835364. The cubic root of 2161256575 is about 1292.9114329052.

It can be divided in two parts, 21612 and 56575, that added together give a palindrome (78187).

The spelling of 2161256575 in words is "two billion, one hundred sixty-one million, two hundred fifty-six thousand, five hundred seventy-five".