42390578771 has 4 divisors (see below), whose sum is σ = 42699999192. Its totient is φ = 42081158352.

The previous prime is 42390578719. The next prime is 42390578777. The reversal of 42390578771 is 17787509324.

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

It is a cyclic number.

It is not a de Polignac number, because 42390578771 - 2¹⁸ = 42390316627 is a prime.

It is a super-2 number, since 2×42390578771² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42390578777) 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, 154710005 + ... + 154710278.

It is an arithmetic number, because the mean of its divisors is an integer number (10674999798).

Almost surely, 2^42390578771 is an apocalyptic number.

42390578771 is a deficient number, since it is larger than the sum of its proper divisors (309420421).

42390578771 is a wasteful number, since it uses less digits than its factorization.

42390578771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309420420.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 42390578771 in words is "forty-two billion, three hundred ninety million, five hundred seventy-eight thousand, seven hundred seventy-one".