2251898865 has 24 divisors (see below), whose sum is σ = 4037889960. Its totient is φ = 1159597824.

The previous prime is 2251898851. The next prime is 2251898911. The reversal of 2251898865 is 5688981522.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 498718224 + 1753180641 = 22332^2 + 41871^2 .

It is not a de Polignac number, because 2251898865 - 2¹⁴ = 2251882481 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 861492 + ... + 864101.

It is an arithmetic number, because the mean of its divisors is an integer number (168245415).

Almost surely, 2^2251898865 is an apocalyptic number.

It is an amenable number.

2251898865 is a deficient number, since it is larger than the sum of its proper divisors (1785991095).

2251898865 is a wasteful number, since it uses less digits than its factorization.

2251898865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725633 (or 1725630 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 54.

The square root of 2251898865 is about 47454.1764758382. The cubic root of 2251898865 is about 1310.7392182027.

The spelling of 2251898865 in words is "two billion, two hundred fifty-one million, eight hundred ninety-eight thousand, eight hundred sixty-five".