2251663240 has 32 divisors (see below), whose sum is σ = 5240943000. Its totient is φ = 869607424.

The previous prime is 2251663213. The next prime is 2251663291. The reversal of 2251663240 is 423661522.

It can be written as a sum of positive squares in 4 ways, for example, as 1367076676 + 884586564 = 36974^2 + 29742^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 969385 + ... + 971704.

Almost surely, 2^2251663240 is an apocalyptic number.

2251663240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2251663240 is an abundant number, since it is smaller than the sum of its proper divisors (2989279760).

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

2251663240 is a wasteful number, since it uses less digits than its factorization.

2251663240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941129 (or 1941125 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2251663240 is about 47451.6937526997. The cubic root of 2251663240 is about 1310.6935006817.

The spelling of 2251663240 in words is "two billion, two hundred fifty-one million, six hundred sixty-three thousand, two hundred forty".