42039691361 has 4 divisors (see below), whose sum is σ = 42166699824. Its totient is φ = 41912682900.

The previous prime is 42039691339. The next prime is 42039691429. The reversal of 42039691361 is 16319693024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42039691361 - 2¹⁴ = 42039674977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42039691961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63503735 + ... + 63504396.

It is an arithmetic number, because the mean of its divisors is an integer number (10541674956).

Almost surely, 2^42039691361 is an apocalyptic number.

It is an amenable number.

42039691361 is a deficient number, since it is larger than the sum of its proper divisors (127008463).

42039691361 is a wasteful number, since it uses less digits than its factorization.

42039691361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127008462.

The product of its (nonzero) digits is 209952, while the sum is 44.

The spelling of 42039691361 in words is "forty-two billion, thirty-nine million, six hundred ninety-one thousand, three hundred sixty-one".