18027720693 has 12 divisors (see below), whose sum is σ = 27004487328. Its totient is φ = 12018480300.

The previous prime is 18027720677. The next prime is 18027720713. The reversal of 18027720693 is 39602772081.

It is not a de Polignac number, because 18027720693 - 2⁴ = 18027720677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18027720793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37093833 + ... + 37094318.

It is an arithmetic number, because the mean of its divisors is an integer number (2250373944).

Almost surely, 2^18027720693 is an apocalyptic number.

It is an amenable number.

18027720693 is a deficient number, since it is larger than the sum of its proper divisors (8976766635).

18027720693 is an frugal number, since it uses more digits than its factorization.

18027720693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74188166 (or 74188154 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

It can be divided in two parts, 18027 and 720693, that added together give a triangular number (738720 = T₁₂₁₅).

The spelling of 18027720693 in words is "eighteen billion, twenty-seven million, seven hundred twenty thousand, six hundred ninety-three".