1818822725 has 24 divisors (see below), whose sum is σ = 2337741000. Its totient is φ = 1402096640.

The previous prime is 1818822721. The next prime is 1818822737. The reversal of 1818822725 is 5272288181.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 1220384356 + 598438369 = 34934^2 + 24463^2 .

It is not a de Polignac number, because 1818822725 - 2² = 1818822721 is a prime.

It is a super-2 number, since 2×1818822725² = 6616232209952851250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818822721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 410321 + ... + 414729.

It is an arithmetic number, because the mean of its divisors is an integer number (97405875).

Almost surely, 2^1818822725 is an apocalyptic number.

It is an amenable number.

1818822725 is a deficient number, since it is larger than the sum of its proper divisors (518918275).

1818822725 is a wasteful number, since it uses less digits than its factorization.

1818822725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017 (or 5012 counting only the distinct ones).

The product of its digits is 143360, while the sum is 44.

The square root of 1818822725 is about 42647.6579075569. The cubic root of 1818822725 is about 1220.6658385015.

The spelling of 1818822725 in words is "one billion, eight hundred eighteen million, eight hundred twenty-two thousand, seven hundred twenty-five".