18791272513 has 8 divisors (see below), whose sum is σ = 20240841600. Its totient is φ = 17342287248.

The previous prime is 18791272471. The next prime is 18791272537. The reversal of 18791272513 is 31527219781.

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

It is a de Polignac number, because none of the positive numbers 2^k-18791272513 is a prime.

It is a super-2 number, since 2×18791272513² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18791272543) 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, 77923 + ... + 208936.

It is an arithmetic number, because the mean of its divisors is an integer number (2530105200).

Almost surely, 2^18791272513 is an apocalyptic number.

18791272513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18791272513 is a deficient number, since it is larger than the sum of its proper divisors (1449569087).

18791272513 is a wasteful number, since it uses less digits than its factorization.

18791272513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291911.

The product of its digits is 211680, while the sum is 46.

The spelling of 18791272513 in words is "eighteen billion, seven hundred ninety-one million, two hundred seventy-two thousand, five hundred thirteen".