2102391555516 has 192 divisors, whose sum is σ = 6435373056000. Its totient is φ = 580843638720.

The previous prime is 2102391555491. The next prime is 2102391555587. The reversal of 2102391555516 is 6155551932012.

2102391555516 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 3 + 91 + 5 + 5 + 551 + 6 = 666.

It is a super-2 number, since 2×2102391555516² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 29939575 + ... + 30009713.

It is an arithmetic number, because the mean of its divisors is an integer number (33517568000).

Almost surely, 2^{2102391555516} 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 2102391555516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3217686528000).

2102391555516 is an abundant number, since it is smaller than the sum of its proper divisors (4332981500484).

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

2102391555516 is a wasteful number, since it uses less digits than its factorization.

2102391555516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71469 (or 71461 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 45.

The spelling of 2102391555516 in words is "two trillion, one hundred two billion, three hundred ninety-one million, five hundred fifty-five thousand, five hundred sixteen".