18261320485 has 8 divisors (see below), whose sum is σ = 21937178520. Its totient is φ = 14593327104.

The previous prime is 18261320479. The next prime is 18261320507. The reversal of 18261320485 is 58402316281.

It can be written as a sum of positive squares in 4 ways, for example, as 56295009 + 18205025476 = 7503^2 + 134926^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18261320485 - 2³ = 18261320477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1961052 + ... + 1970341.

It is an arithmetic number, because the mean of its divisors is an integer number (2742147315).

Almost surely, 2^18261320485 is an apocalyptic number.

It is an amenable number.

18261320485 is a deficient number, since it is larger than the sum of its proper divisors (3675858035).

18261320485 is an equidigital number, since it uses as much as digits as its factorization.

18261320485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932327.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 18261320485 in words is "eighteen billion, two hundred sixty-one million, three hundred twenty thousand, four hundred eighty-five".