18154994616 has 192 divisors, whose sum is σ = 58046526720. Its totient is φ = 5262174720.

The previous prime is 18154994609. The next prime is 18154994617. The reversal of 18154994616 is 61649945181.

18154994616 is a `hidden beast` number, since 1 + 8 + 1 + 549 + 94 + 6 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18154994617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 473376 + ... + 510288.

It is an arithmetic number, because the mean of its divisors is an integer number (302325660).

Almost surely, 2^18154994616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18154994616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29023263360).

18154994616 is an abundant number, since it is smaller than the sum of its proper divisors (39891532104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18154994616 is a wasteful number, since it uses less digits than its factorization.

18154994616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36968 (or 36952 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 18154994616 in words is "eighteen billion, one hundred fifty-four million, nine hundred ninety-four thousand, six hundred sixteen".