42947836852565 has 4 divisors (see below), whose sum is σ = 51537404223084. Its totient is φ = 34358269482048.

The previous prime is 42947836852519. The next prime is 42947836852621. The reversal of 42947836852565 is 56525863874924.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8327016321649 + 34620820530916 = 2885657^2 + 5883946^2 .

It is a cyclic number.

It is not a de Polignac number, because 42947836852565 - 2²⁰ = 42947835803989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42947836852492 and 42947836852501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4294783685252 + ... + 4294783685261.

It is an arithmetic number, because the mean of its divisors is an integer number (12884351055771).

Almost surely, 2^{42947836852565} is an apocalyptic number.

It is an amenable number.

42947836852565 is a deficient number, since it is larger than the sum of its proper divisors (8589567370519).

42947836852565 is an equidigital number, since it uses as much as digits as its factorization.

42947836852565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8589567370518.

The product of its digits is 3483648000, while the sum is 74.

The spelling of 42947836852565 in words is "forty-two trillion, nine hundred forty-seven billion, eight hundred thirty-six million, eight hundred fifty-two thousand, five hundred sixty-five".