18115245551 has 8 divisors (see below), whose sum is σ = 19509846720. Its totient is φ = 16720804512.

The previous prime is 18115245541. The next prime is 18115245569. The reversal of 18115245551 is 15554251181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18115245551 - 2¹⁸ = 18114983407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115245541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305345 + ... + 359813.

It is an arithmetic number, because the mean of its divisors is an integer number (2438730840).

Almost surely, 2^18115245551 is an apocalyptic number.

18115245551 is a deficient number, since it is larger than the sum of its proper divisors (1394601169).

18115245551 is a wasteful number, since it uses less digits than its factorization.

18115245551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80065.

The product of its digits is 40000, while the sum is 38.

The spelling of 18115245551 in words is "eighteen billion, one hundred fifteen million, two hundred forty-five thousand, five hundred fifty-one".