42102623561 has 2 divisors, whose sum is σ = 42102623562. Its totient is φ = 42102623560.

The previous prime is 42102623513. The next prime is 42102623579. The reversal of 42102623561 is 16532620124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30465607936 + 11637015625 = 174544^2 + 107875^2 .

It is a cyclic number.

It is not a de Polignac number, because 42102623561 - 2¹⁴ = 42102607177 is a prime.

It is not a weakly prime, because it can be changed into another prime (42102623461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21051311780 + 21051311781.

It is an arithmetic number, because the mean of its divisors is an integer number (21051311781).

Almost surely, 2^42102623561 is an apocalyptic number.

It is an amenable number.

42102623561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42102623561 is an equidigital number, since it uses as much as digits as its factorization.

42102623561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 42102623561 in words is "forty-two billion, one hundred two million, six hundred twenty-three thousand, five hundred sixty-one".