18001679690129 has 4 divisors (see below), whose sum is σ = 18488211573684. Its totient is φ = 17515147806576.

The previous prime is 18001679690123. The next prime is 18001679690147. The reversal of 18001679690129 is 92109697610081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17218723707025 + 782955983104 = 4149545^2 + 884848^2 .

It is a cyclic number.

It is not a de Polignac number, because 18001679690129 - 2¹² = 18001679686033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18001679690123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243265941722 + ... + 243265941795.

It is an arithmetic number, because the mean of its divisors is an integer number (4622052893421).

Almost surely, 2^{18001679690129} is an apocalyptic number.

It is an amenable number.

18001679690129 is a deficient number, since it is larger than the sum of its proper divisors (486531883555).

18001679690129 is an equidigital number, since it uses as much as digits as its factorization.

18001679690129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486531883554.

The product of its (nonzero) digits is 2939328, while the sum is 59.

The spelling of 18001679690129 in words is "eighteen trillion, one billion, six hundred seventy-nine million, six hundred ninety thousand, one hundred twenty-nine".