42504591865 has 4 divisors (see below), whose sum is σ = 51005510244. Its totient is φ = 34003673488.

The previous prime is 42504591851. The next prime is 42504591881. The reversal of 42504591865 is 56819540524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11038444096 + 31466147769 = 105064^2 + 177387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42504591865 is a prime.

It is a super-2 number, since 2×42504591865² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250459182 + ... + 4250459191.

It is an arithmetic number, because the mean of its divisors is an integer number (12751377561).

Almost surely, 2^42504591865 is an apocalyptic number.

It is an amenable number.

42504591865 is a deficient number, since it is larger than the sum of its proper divisors (8500918379).

42504591865 is an equidigital number, since it uses as much as digits as its factorization.

42504591865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8500918378.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 42504591865 in words is "forty-two billion, five hundred four million, five hundred ninety-one thousand, eight hundred sixty-five".