2116701720505 has 16 divisors (see below), whose sum is σ = 2591727650064. Its totient is φ = 1659120353280.

The previous prime is 2116701720499. The next prime is 2116701720559. The reversal of 2116701720505 is 5050271076112.

It can be written as a sum of positive squares in 8 ways, for example, as 375455209536 + 1741246510969 = 612744^2 + 1319563^2 .

It is not a de Polignac number, because 2116701720505 - 2¹⁹ = 2116701196217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13423572 + ... + 13580341.

It is an arithmetic number, because the mean of its divisors is an integer number (161982978129).

Almost surely, 2^{2116701720505} is an apocalyptic number.

It is an amenable number.

2116701720505 is a deficient number, since it is larger than the sum of its proper divisors (475025929559).

2116701720505 is a wasteful number, since it uses less digits than its factorization.

2116701720505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27004236.

The product of its (nonzero) digits is 29400, while the sum is 37.

Adding to 2116701720505 its reverse (5050271076112), we get a palindrome (7166972796617).

The spelling of 2116701720505 in words is "two trillion, one hundred sixteen billion, seven hundred one million, seven hundred twenty thousand, five hundred five".