2111561210639 has 2 divisors, whose sum is σ = 2111561210640. Its totient is φ = 2111561210638.

The previous prime is 2111561210623. The next prime is 2111561210699. The reversal of 2111561210639 is 9360121651112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2111561210639 - 2⁴ = 2111561210623 is a prime.

It is a super-3 number, since 3×2111561210639³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111561210699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055780605319 + 1055780605320.

It is an arithmetic number, because the mean of its divisors is an integer number (1055780605320).

Almost surely, 2^{2111561210639} is an apocalyptic number.

2111561210639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111561210639 is an equidigital number, since it uses as much as digits as its factorization.

2111561210639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 2111561210639 in words is "two trillion, one hundred eleven billion, five hundred sixty-one million, two hundred ten thousand, six hundred thirty-nine".