2251657500 has 60 divisors (see below), whose sum is σ = 6565254696. Its totient is φ = 600440000.

The previous prime is 2251657487. The next prime is 2251657511. The reversal of 2251657500 is 57561522.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×2251657500² = 10139922994612500000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 142611 + ... + 157610.

Almost surely, 2^2251657500 is an apocalyptic number.

2251657500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2251657500 is an abundant number, since it is smaller than the sum of its proper divisors (4313597196).

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

2251657500 is a wasteful number, since it uses less digits than its factorization.

2251657500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300248 (or 300231 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 2251657500 is about 47451.6332700994. The cubic root of 2251657500 is about 1310.6923869292.

The spelling of 2251657500 in words is "two billion, two hundred fifty-one million, six hundred fifty-seven thousand, five hundred".