42765856517 has 4 divisors (see below), whose sum is σ = 42768143040. Its totient is φ = 42763569996.

The previous prime is 42765856513. The next prime is 42765856519. The reversal of 42765856517 is 71565856724.

42765856517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42765856517 - 2² = 42765856513 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 (42765856513) 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, 1114973 + ... + 1152690.

It is an arithmetic number, because the mean of its divisors is an integer number (10692035760).

Almost surely, 2^42765856517 is an apocalyptic number.

It is an amenable number.

42765856517 is a deficient number, since it is larger than the sum of its proper divisors (2286523).

42765856517 is a wasteful number, since it uses less digits than its factorization.

42765856517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286522.

The product of its digits is 14112000, while the sum is 56.

The spelling of 42765856517 in words is "forty-two billion, seven hundred sixty-five million, eight hundred fifty-six thousand, five hundred seventeen".