18640791105 has 16 divisors (see below), whose sum is σ = 30631354944. Its totient is φ = 9673058880.

The previous prime is 18640791101. The next prime is 18640791109. The reversal of 18640791105 is 50119704681.

It is an interprime number because it is at equal distance from previous prime (18640791101) and next prime (18640791109).

It is not a de Polignac number, because 18640791105 - 2² = 18640791101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18640791101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16792951 + ... + 16794060.

It is an arithmetic number, because the mean of its divisors is an integer number (1914459684).

Almost surely, 2^18640791105 is an apocalyptic number.

18640791105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18640791105 is a deficient number, since it is larger than the sum of its proper divisors (11990563839).

18640791105 is a wasteful number, since it uses less digits than its factorization.

18640791105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33587056.

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 18640791105 in words is "eighteen billion, six hundred forty million, seven hundred ninety-one thousand, one hundred five".