18813194497 has 16 divisors (see below), whose sum is σ = 19115389440. Its totient is φ = 18514080000.

The previous prime is 18813194479. The next prime is 18813194501. The reversal of 18813194497 is 79449131881.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18813194497 - 2⁷ = 18813194369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18813194467) 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, 9641872 + ... + 9643822.

It is an arithmetic number, because the mean of its divisors is an integer number (1194711840).

Almost surely, 2^18813194497 is an apocalyptic number.

It is an amenable number.

18813194497 is a deficient number, since it is larger than the sum of its proper divisors (302194943).

18813194497 is a wasteful number, since it uses less digits than its factorization.

18813194497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664.

The product of its digits is 1741824, while the sum is 55.

The spelling of 18813194497 in words is "eighteen billion, eight hundred thirteen million, one hundred ninety-four thousand, four hundred ninety-seven".