20102566123 has 2 divisors, whose sum is σ = 20102566124. Its totient is φ = 20102566122.

The previous prime is 20102566109. The next prime is 20102566129. The reversal of 20102566123 is 32166520102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102566123 is a prime.

It is a super-2 number, since 2×20102566123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20102566091 and 20102566100.

It is not a weakly prime, because it can be changed into another prime (20102566129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051283061 + 10051283062.

It is an arithmetic number, because the mean of its divisors is an integer number (10051283062).

Almost surely, 2^20102566123 is an apocalyptic number.

20102566123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102566123 is an equidigital number, since it uses as much as digits as its factorization.

20102566123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 20102566123 in words is "twenty billion, one hundred two million, five hundred sixty-six thousand, one hundred twenty-three".