18219504725 has 6 divisors (see below), whose sum is σ = 22592185890. Its totient is φ = 14575603760.

The previous prime is 18219504703. The next prime is 18219504731. The reversal of 18219504725 is 52740591281.

It can be written as a sum of positive squares in 3 ways, for example, as 67601284 + 18151903441 = 8222^2 + 134729^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18219504725 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364390070 + ... + 364390119.

It is an arithmetic number, because the mean of its divisors is an integer number (3765364315).

Almost surely, 2^18219504725 is an apocalyptic number.

It is an amenable number.

18219504725 is a deficient number, since it is larger than the sum of its proper divisors (4372681165).

18219504725 is an equidigital number, since it uses as much as digits as its factorization.

18219504725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728780199 (or 728780194 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 18219504725 in words is "eighteen billion, two hundred nineteen million, five hundred four thousand, seven hundred twenty-five".