2251638684 has 18 divisors (see below), whose sum is σ = 5691642320. Its totient is φ = 750546216.

The previous prime is 2251638671. The next prime is 2251638721. The reversal of 2251638684 is 4868361522.

2251638684 is a `hidden beast` number, since 2 + 2 + 5 + 1 + 638 + 6 + 8 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31272724 + ... + 31272795.

Almost surely, 2^2251638684 is an apocalyptic number.

It is an amenable number.

2251638684 is an abundant number, since it is smaller than the sum of its proper divisors (3440003636).

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

2251638684 is a wasteful number, since it uses less digits than its factorization.

2251638684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62545529 (or 62545524 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 2251638684 is about 47451.4350046445. The cubic root of 2251638684 is about 1310.6887359807.

The spelling of 2251638684 in words is "two billion, two hundred fifty-one million, six hundred thirty-eight thousand, six hundred eighty-four".