2116645301620 has 72 divisors (see below), whose sum is σ = 4577048793576. Its totient is φ = 822185747712.

The previous prime is 2116645301581. The next prime is 2116645301657. The reversal of 2116645301620 is 261035466112.

It can be written as a sum of positive squares in 4 ways, for example, as 154735236496 + 1961910065124 = 393364^2 + 1400682^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2116645301620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6232114 + ... + 6562966.

It is an arithmetic number, because the mean of its divisors is an integer number (63570122133).

Almost surely, 2^{2116645301620} is an apocalyptic number.

2116645301620 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 2116645301620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2288524396788).

2116645301620 is an abundant number, since it is smaller than the sum of its proper divisors (2460403491956).

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

2116645301620 is a wasteful number, since it uses less digits than its factorization.

2116645301620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331121 (or 331076 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 2116645301620 in words is "two trillion, one hundred sixteen billion, six hundred forty-five million, three hundred one thousand, six hundred twenty".