42056686261 has 2 divisors, whose sum is σ = 42056686262. Its totient is φ = 42056686260.

The previous prime is 42056686183. The next prime is 42056686267. The reversal of 42056686261 is 16268665024.

42056686261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41863615236 + 193071025 = 204606^2 + 13895^2 .

It is a cyclic number.

It is not a de Polignac number, because 42056686261 - 2³⁵ = 7696947893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42056686267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21028343130 + 21028343131.

It is an arithmetic number, because the mean of its divisors is an integer number (21028343131).

Almost surely, 2^42056686261 is an apocalyptic number.

It is an amenable number.

42056686261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42056686261 is an equidigital number, since it uses as much as digits as its factorization.

42056686261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 42056686261 in words is "forty-two billion, fifty-six million, six hundred eighty-six thousand, two hundred sixty-one".