22512901849 has 27 divisors (see below), whose sum is σ = 24380537853. Its totient is φ = 20785156704.

The previous prime is 22512901799. The next prime is 22512901861. The reversal of 22512901849 is 94810921522.

The square root of 22512901849 is 150043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 953265625 + 21559636224 = 30875^2 + 146832^2 .

It is not a de Polignac number, because 22512901849 - 2⁹ = 22512901337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22512901549) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 151093227 + ... + 151093375.

Almost surely, 2^22512901849 is an apocalyptic number.

22512901849 is the 150043-rd square number.

22512901849 is the 75022-nd centered octagonal number.

It is an amenable number.

22512901849 is a deficient number, since it is larger than the sum of its proper divisors (1867636004).

22512901849 is an frugal number, since it uses more digits than its factorization.

22512901849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 22512901849 in words is "twenty-two billion, five hundred twelve million, nine hundred one thousand, eight hundred forty-nine".