42591821851 has 2 divisors, whose sum is σ = 42591821852. Its totient is φ = 42591821850.

The previous prime is 42591821759. The next prime is 42591821887. The reversal of 42591821851 is 15812819524.

42591821851 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 is a cyclic number.

It is not a de Polignac number, because 42591821851 - 2²⁹ = 42054950939 is a prime.

It is not a weakly prime, because it can be changed into another prime (42591821551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21295910925 + 21295910926.

It is an arithmetic number, because the mean of its divisors is an integer number (21295910926).

Almost surely, 2^42591821851 is an apocalyptic number.

42591821851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42591821851 is an equidigital number, since it uses as much as digits as its factorization.

42591821851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 46.

The spelling of 42591821851 in words is "forty-two billion, five hundred ninety-one million, eight hundred twenty-one thousand, eight hundred fifty-one".