42943393649 has 12 divisors (see below), whose sum is σ = 47023332300. Its totient is φ = 39194648064.

The previous prime is 42943393637. The next prime is 42943393651. The reversal of 42943393649 is 94639334924.

It can be written as a sum of positive squares in 6 ways, for example, as 19145703424 + 23797690225 = 138368^2 + 154265^2 .

It is not a de Polignac number, because 42943393649 - 2²⁰ = 42942345073 is a prime.

It is a super-4 number, since 4×42943393649⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42943393594 and 42943393603.

It is not an unprimeable number, because it can be changed into a prime (42943393699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1412504 + ... + 1442585.

It is an arithmetic number, because the mean of its divisors is an integer number (3918611025).

Almost surely, 2^42943393649 is an apocalyptic number.

It is an amenable number.

42943393649 is a deficient number, since it is larger than the sum of its proper divisors (4079938651).

42943393649 is a wasteful number, since it uses less digits than its factorization.

42943393649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855204 (or 2855191 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 56.

The spelling of 42943393649 in words is "forty-two billion, nine hundred forty-three million, three hundred ninety-three thousand, six hundred forty-nine".