42259640642 has 6 divisors (see below), whose sum is σ = 63389897049. Its totient is φ = 21129674960.

The previous prime is 42259640557. The next prime is 42259640669. The reversal of 42259640642 is 24604695224.

It can be written as a sum of positive squares in 2 ways, for example, as 27888666001 + 14370974641 = 166999^2 + 119879^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=145361.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42259640593 and 42259640602.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 218042 + ... + 363402.

Almost surely, 2^42259640642 is an apocalyptic number.

42259640642 is a deficient number, since it is larger than the sum of its proper divisors (21130256407).

42259640642 is an frugal number, since it uses more digits than its factorization.

42259640642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290724 (or 145363 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 42259640642 in words is "forty-two billion, two hundred fifty-nine million, six hundred forty thousand, six hundred forty-two".