42261645631 has 2 divisors, whose sum is σ = 42261645632. Its totient is φ = 42261645630.

The previous prime is 42261645611. The next prime is 42261645653. The reversal of 42261645631 is 13654616224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42261645631 - 2²³ = 42253257023 is a prime.

It is a super-2 number, since 2×42261645631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42261645611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21130822815 + 21130822816.

It is an arithmetic number, because the mean of its divisors is an integer number (21130822816).

Almost surely, 2^42261645631 is an apocalyptic number.

42261645631 is a deficient number, since it is larger than the sum of its proper divisors (1).

42261645631 is an equidigital number, since it uses as much as digits as its factorization.

42261645631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 40.

The spelling of 42261645631 in words is "forty-two billion, two hundred sixty-one million, six hundred forty-five thousand, six hundred thirty-one".