18244899196551 has 24 divisors (see below), whose sum is σ = 28430453366640. Its totient is φ = 11231784036096.

The previous prime is 18244899196543. The next prime is 18244899196597. The reversal of 18244899196551 is 15569199844281.

It is a happy number.

18244899196551 is a `hidden beast` number, since 1 + 8 + 2 + 4 + 489 + 9 + 1 + 96 + 5 + 51 = 666.

It is not a de Polignac number, because 18244899196551 - 2³ = 18244899196543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18244899196551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18244899196541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1124970261 + ... + 1124986478.

It is an arithmetic number, because the mean of its divisors is an integer number (1184602223610).

Almost surely, 2^{18244899196551} is an apocalyptic number.

18244899196551 is a deficient number, since it is larger than the sum of its proper divisors (10185554170089).

18244899196551 is a wasteful number, since it uses less digits than its factorization.

18244899196551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249956815 (or 2249956812 counting only the distinct ones).

The product of its digits is 223948800, while the sum is 72.

The spelling of 18244899196551 in words is "eighteen trillion, two hundred forty-four billion, eight hundred ninety-nine million, one hundred ninety-six thousand, five hundred fifty-one".