18311723225 has 12 divisors (see below), whose sum is σ = 22711213056. Its totient is φ = 14646361680.

The previous prime is 18311723207. The next prime is 18311723231. The reversal of 18311723225 is 52232711381.

It is not a de Polignac number, because 18311723225 - 2¹⁰ = 18311722201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52664 + ... + 198486.

It is an arithmetic number, because the mean of its divisors is an integer number (1892601088).

Almost surely, 2^18311723225 is an apocalyptic number.

It is an amenable number.

18311723225 is a deficient number, since it is larger than the sum of its proper divisors (4399489831).

18311723225 is a wasteful number, since it uses less digits than its factorization.

18311723225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150856 (or 150851 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The spelling of 18311723225 in words is "eighteen billion, three hundred eleven million, seven hundred twenty-three thousand, two hundred twenty-five".