11566855701631 has 2 divisors, whose sum is σ = 11566855701632. Its totient is φ = 11566855701630.

The previous prime is 11566855701613. The next prime is 11566855701637. The reversal of 11566855701631 is 13610755866511.

11566855701631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (11566855701613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13610755866511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11566855701631 - 2¹³ = 11566855693439 is a prime.

It is a super-2 number, since 2×11566855701631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11566855701637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783427850815 + 5783427850816.

It is an arithmetic number, because the mean of its divisors is an integer number (5783427850816).

Almost surely, 2^{11566855701631} is an apocalyptic number.

11566855701631 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566855701631 is an equidigital number, since it uses as much as digits as its factorization.

11566855701631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 55.

The spelling of 11566855701631 in words is "eleven trillion, five hundred sixty-six billion, eight hundred fifty-five million, seven hundred one thousand, six hundred thirty-one".