18185976253 has 8 divisors (see below), whose sum is σ = 19257068088. Its totient is φ = 17115032064.

The previous prime is 18185976239. The next prime is 18185976257. The reversal of 18185976253 is 35267958181.

It can be written as a sum of positive squares in 4 ways, for example, as 4327271524 + 13858704729 = 65782^2 + 117723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18185976253 - 2⁹ = 18185975741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18185976194 and 18185976203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18185976257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309825 + ... + 363817.

It is an arithmetic number, because the mean of its divisors is an integer number (2407133511).

Almost surely, 2^18185976253 is an apocalyptic number.

It is an amenable number.

18185976253 is a deficient number, since it is larger than the sum of its proper divisors (1071091835).

18185976253 is a wasteful number, since it uses less digits than its factorization.

18185976253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73823.

The product of its digits is 3628800, while the sum is 55.

The spelling of 18185976253 in words is "eighteen billion, one hundred eighty-five million, nine hundred seventy-six thousand, two hundred fifty-three".