2256621345 has 48 divisors (see below), whose sum is σ = 4371179904. Its totient is φ = 1067424000.

The previous prime is 2256621337. The next prime is 2256621359. The reversal of 2256621345 is 5431266522.

2256621345 is a `hidden beast` number, since 2 + 25 + 6 + 621 + 3 + 4 + 5 = 666.

It is not a de Polignac number, because 2256621345 - 2³ = 2256621337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35301 + ... + 75890.

It is an arithmetic number, because the mean of its divisors is an integer number (91066248).

Almost surely, 2^2256621345 is an apocalyptic number.

It is an amenable number.

2256621345 is a deficient number, since it is larger than the sum of its proper divisors (2114558559).

2256621345 is a wasteful number, since it uses less digits than its factorization.

2256621345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111254 (or 111251 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 2256621345 is about 47503.9087339137. The cubic root of 2256621345 is about 1311.6548332981.

Adding to 2256621345 its reverse (5431266522), we get a palindrome (7687887867).

The spelling of 2256621345 in words is "two billion, two hundred fifty-six million, six hundred twenty-one thousand, three hundred forty-five".