18328728261 has 8 divisors (see below), whose sum is σ = 24451987104. Its totient is φ = 12212310800.

The previous prime is 18328728259. The next prime is 18328728281. The reversal of 18328728261 is 16282782381.

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 18328728261 - 2¹ = 18328728259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18328728261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18328728241) 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, 1704090 + ... + 1714811.

It is an arithmetic number, because the mean of its divisors is an integer number (3056498388).

Almost surely, 2^18328728261 is an apocalyptic number.

It is an amenable number.

18328728261 is a deficient number, since it is larger than the sum of its proper divisors (6123258843).

18328728261 is a wasteful number, since it uses less digits than its factorization.

18328728261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420691.

The product of its digits is 516096, while the sum is 48.

The spelling of 18328728261 in words is "eighteen billion, three hundred twenty-eight million, seven hundred twenty-eight thousand, two hundred sixty-one".