18736121669 has 16 divisors (see below), whose sum is σ = 19892692800. Its totient is φ = 17619659904.

The previous prime is 18736121647. The next prime is 18736121681. The reversal of 18736121669 is 96612163781.

It is a cyclic number.

It is not a de Polignac number, because 18736121669 - 2¹² = 18736117573 is a prime.

It is a super-2 number, since 2×18736121669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18736121639) 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, 118754 + ... + 227100.

It is an arithmetic number, because the mean of its divisors is an integer number (1243293300).

Almost surely, 2^18736121669 is an apocalyptic number.

It is an amenable number.

18736121669 is a deficient number, since it is larger than the sum of its proper divisors (1156571131).

18736121669 is a wasteful number, since it uses less digits than its factorization.

18736121669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108532.

The product of its digits is 653184, while the sum is 50.

The spelling of 18736121669 in words is "eighteen billion, seven hundred thirty-six million, one hundred twenty-one thousand, six hundred sixty-nine".