18061996191516 has 576 divisors, whose sum is σ = 50982764851200. Its totient is φ = 5520536985600.

The previous prime is 18061996191479. The next prime is 18061996191517. The reversal of 18061996191516 is 61519169916081.

18061996191516 is a `hidden beast` number, since 1 + 8 + 0 + 6 + 1 + 9 + 9 + 619 + 1 + 5 + 1 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061996191517) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 53596427700 + ... + 53596428036.

Almost surely, 2^{18061996191516} 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 18061996191516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25491382425600).

18061996191516 is an abundant number, since it is smaller than the sum of its proper divisors (32920768659684).

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

18061996191516 is a wasteful number, since it uses less digits than its factorization.

18061996191516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 63.

The spelling of 18061996191516 in words is "eighteen trillion, sixty-one billion, nine hundred ninety-six million, one hundred ninety-one thousand, five hundred sixteen".