18137258779673 has 4 divisors (see below), whose sum is σ = 19786100486928. Its totient is φ = 16488417072420.

The previous prime is 18137258779657. The next prime is 18137258779681. The reversal of 18137258779673 is 37697785273181.

It is a happy number.

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 not a de Polignac number, because 18137258779673 - 2⁴ = 18137258779657 is a prime.

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 18137258779673.

It is not an unprimeable number, because it can be changed into a prime (18137258779273) 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, 824420853611 + ... + 824420853632.

It is an arithmetic number, because the mean of its divisors is an integer number (4946525121732).

Almost surely, 2^{18137258779673} is an apocalyptic number.

It is an amenable number.

18137258779673 is a deficient number, since it is larger than the sum of its proper divisors (1648841707255).

18137258779673 is a wasteful number, since it uses less digits than its factorization.

18137258779673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648841707254.

The product of its digits is 746807040, while the sum is 74.

The spelling of 18137258779673 in words is "eighteen trillion, one hundred thirty-seven billion, two hundred fifty-eight million, seven hundred seventy-nine thousand, six hundred seventy-three".