15642406123 has 2 divisors, whose sum is σ = 15642406124. Its totient is φ = 15642406122.

The previous prime is 15642406081. The next prime is 15642406147. The reversal of 15642406123 is 32160424651.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15642406123 is a prime.

It is a super-2 number, since 2×15642406123² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15642406723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821203061 + 7821203062.

It is an arithmetic number, because the mean of its divisors is an integer number (7821203062).

Almost surely, 2^15642406123 is an apocalyptic number.

15642406123 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642406123 is an equidigital number, since it uses as much as digits as its factorization.

15642406123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 15642406123 in words is "fifteen billion, six hundred forty-two million, four hundred six thousand, one hundred twenty-three".