18861728730149 has 8 divisors (see below), whose sum is σ = 18931684253568. Its totient is φ = 18791775817920.

The previous prime is 18861728730137. The next prime is 18861728730151. The reversal of 18861728730149 is 94103782716881.

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 18861728730149 - 2²⁴ = 18861711952933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861728735149) 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, 14469074 + ... + 15718700.

It is an arithmetic number, because the mean of its divisors is an integer number (2366460531696).

Almost surely, 2^{18861728730149} is an apocalyptic number.

It is an amenable number.

18861728730149 is a deficient number, since it is larger than the sum of its proper divisors (69955523419).

18861728730149 is a wasteful number, since it uses less digits than its factorization.

18861728730149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305595.

The product of its (nonzero) digits is 32514048, while the sum is 65.

The spelling of 18861728730149 in words is "eighteen trillion, eight hundred sixty-one billion, seven hundred twenty-eight million, seven hundred thirty thousand, one hundred forty-nine".