183117756721 has 2 divisors, whose sum is σ = 183117756722. Its totient is φ = 183117756720.

The previous prime is 183117756719. The next prime is 183117756743. The reversal of 183117756721 is 127657711381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180132336400 + 2985420321 = 424420^2 + 54639^2 .

It is a cyclic number.

It is not a de Polignac number, because 183117756721 - 2¹ = 183117756719 is a prime.

It is a super-2 number, since 2×183117756721² (a number of 23 digits) contains 22 as substring.

Together with 183117756719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (183117756751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91558878360 + 91558878361.

It is an arithmetic number, because the mean of its divisors is an integer number (91558878361).

Almost surely, 2^183117756721 is an apocalyptic number.

It is an amenable number.

183117756721 is a deficient number, since it is larger than the sum of its proper divisors (1).

183117756721 is an equidigital number, since it uses as much as digits as its factorization.

183117756721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 49.

The spelling of 183117756721 in words is "one hundred eighty-three billion, one hundred seventeen million, seven hundred fifty-six thousand, seven hundred twenty-one".