18641395079 has 4 divisors (see below), whose sum is σ = 18641668320. Its totient is φ = 18641121840.

The previous prime is 18641395063. The next prime is 18641395099. The reversal of 18641395079 is 97059314681.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97059314681 = 7 ⋅13865616383.

It is a cyclic number.

It is not a de Polignac number, because 18641395079 - 2⁴ = 18641395063 is a prime.

It is a super-2 number, since 2×18641395079² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18641395079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18641395039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61019 + ... + 202499.

It is an arithmetic number, because the mean of its divisors is an integer number (4660417080).

Almost surely, 2^18641395079 is an apocalyptic number.

18641395079 is a deficient number, since it is larger than the sum of its proper divisors (273241).

18641395079 is a wasteful number, since it uses less digits than its factorization.

18641395079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273240.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 18641395079 in words is "eighteen billion, six hundred forty-one million, three hundred ninety-five thousand, seventy-nine".