42739561397 has 16 divisors (see below), whose sum is σ = 47551000560. Its totient is φ = 38385562176.

The previous prime is 42739561349. The next prime is 42739561411. The reversal of 42739561397 is 79316593724.

It can be written as a sum of positive squares in 8 ways, for example, as 8116027921 + 34623533476 = 90089^2 + 186074^2 .

It is not a de Polignac number, because 42739561397 - 2¹⁰ = 42739560373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42739561327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181598 + ... + 344175.

It is an arithmetic number, because the mean of its divisors is an integer number (2971937535).

Almost surely, 2^42739561397 is an apocalyptic number.

It is an amenable number.

42739561397 is a deficient number, since it is larger than the sum of its proper divisors (4811439163).

42739561397 is an equidigital number, since it uses as much as digits as its factorization.

42739561397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525849 (or 525823 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 56.

The spelling of 42739561397 in words is "forty-two billion, seven hundred thirty-nine million, five hundred sixty-one thousand, three hundred ninety-seven".