2116710521655 has 32 divisors (see below), whose sum is σ = 3484858671360. Its totient is φ = 1096498341120.

The previous prime is 2116710521599. The next prime is 2116710521669. The reversal of 2116710521655 is 5561250176112.

It is a happy number.

It is not a de Polignac number, because 2116710521655 - 2¹⁵ = 2116710488887 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9051366 + ... + 9282275.

It is an arithmetic number, because the mean of its divisors is an integer number (108901833480).

Almost surely, 2^{2116710521655} is an apocalyptic number.

2116710521655 is a deficient number, since it is larger than the sum of its proper divisors (1368148149705).

2116710521655 is a wasteful number, since it uses less digits than its factorization.

2116710521655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18333871.

The product of its (nonzero) digits is 126000, while the sum is 42.

Adding to 2116710521655 its reverse (5561250176112), we get a palindrome (7677960697767).

The spelling of 2116710521655 in words is "two trillion, one hundred sixteen billion, seven hundred ten million, five hundred twenty-one thousand, six hundred fifty-five".