105666256123 has 2 divisors, whose sum is σ = 105666256124. Its totient is φ = 105666256122.

The previous prime is 105666256103. The next prime is 105666256139. The reversal of 105666256123 is 321652666501.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105666256123 is a prime.

It is a super-2 number, since 2×105666256123² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105666256123.

It is not a weakly prime, because it can be changed into another prime (105666256103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52833128061 + 52833128062.

It is an arithmetic number, because the mean of its divisors is an integer number (52833128062).

Almost surely, 2^105666256123 is an apocalyptic number.

105666256123 is a deficient number, since it is larger than the sum of its proper divisors (1).

105666256123 is an equidigital number, since it uses as much as digits as its factorization.

105666256123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 105666256123 in words is "one hundred five billion, six hundred sixty-six million, two hundred fifty-six thousand, one hundred twenty-three".