2116555515780 has 192 divisors, whose sum is σ = 6396364800000. Its totient is φ = 521407434240.

The previous prime is 2116555515769. The next prime is 2116555515791. The reversal of 2116555515780 is 875155556112.

It is an interprime number because it is at equal distance from previous prime (2116555515769) and next prime (2116555515791).

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 21297646 + ... + 21396794.

It is an arithmetic number, because the mean of its divisors is an integer number (33314400000).

Almost surely, 2^{2116555515780} is an apocalyptic number.

2116555515780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2116555515780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3198182400000).

2116555515780 is an abundant number, since it is smaller than the sum of its proper divisors (4279809284220).

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

2116555515780 is a wasteful number, since it uses less digits than its factorization.

2116555515780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99714 (or 99712 counting only the distinct ones).

The product of its (nonzero) digits is 2100000, while the sum is 51.

The spelling of 2116555515780 in words is "two trillion, one hundred sixteen billion, five hundred fifty-five million, five hundred fifteen thousand, seven hundred eighty".