18072916991 has 8 divisors (see below), whose sum is σ = 18222580224. Its totient is φ = 17923368960.

The previous prime is 18072916969. The next prime is 18072916999. The reversal of 18072916991 is 19961927081.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18072916991 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 (18072916999) 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, 301871 + ... + 356751.

It is an arithmetic number, because the mean of its divisors is an integer number (2277822528).

Almost surely, 2^18072916991 is an apocalyptic number.

18072916991 is a deficient number, since it is larger than the sum of its proper divisors (149663233).

18072916991 is a wasteful number, since it uses less digits than its factorization.

18072916991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57601.

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 18072916991 in words is "eighteen billion, seventy-two million, nine hundred sixteen thousand, nine hundred ninety-one".