42537232565 has 4 divisors (see below), whose sum is σ = 51044679084. Its totient is φ = 34029786048.

The previous prime is 42537232531. The next prime is 42537232589. The reversal of 42537232565 is 56523273524.

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 21547597681 + 20989634884 = 146791^2 + 144878^2 .

It is a cyclic number.

It is not a de Polignac number, because 42537232565 - 2²⁴ = 42520455349 is a prime.

It is a Duffinian number.

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, 4253723252 + ... + 4253723261.

It is an arithmetic number, because the mean of its divisors is an integer number (12761169771).

Almost surely, 2^42537232565 is an apocalyptic number.

It is an amenable number.

42537232565 is a deficient number, since it is larger than the sum of its proper divisors (8507446519).

42537232565 is an equidigital number, since it uses as much as digits as its factorization.

42537232565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8507446518.

The product of its digits is 1512000, while the sum is 44.

The spelling of 42537232565 in words is "forty-two billion, five hundred thirty-seven million, two hundred thirty-two thousand, five hundred sixty-five".