18915154093 has 4 divisors (see below), whose sum is σ = 20634713568. Its totient is φ = 17195594620.

The previous prime is 18915154079. The next prime is 18915154099. The reversal of 18915154093 is 39045151981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18915154093 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 (18915154099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859779721 + ... + 859779742.

It is an arithmetic number, because the mean of its divisors is an integer number (5158678392).

Almost surely, 2^18915154093 is an apocalyptic number.

It is an amenable number.

18915154093 is a deficient number, since it is larger than the sum of its proper divisors (1719559475).

18915154093 is a wasteful number, since it uses less digits than its factorization.

18915154093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719559474.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 18915154093 in words is "eighteen billion, nine hundred fifteen million, one hundred fifty-four thousand, ninety-three".