42520524317661 has 16 divisors (see below), whose sum is σ = 61058011160384. Its totient is φ = 26165233937664.

The previous prime is 42520524317641. The next prime is 42520524317699. The reversal of 42520524317661 is 16671342502524.

It is a happy number.

It is not a de Polignac number, because 42520524317661 - 2⁶ = 42520524317597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42520524317661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42520524317611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25054636 + ... + 26697861.

It is an arithmetic number, because the mean of its divisors is an integer number (3816125697524).

Almost surely, 2^{42520524317661} is an apocalyptic number.

It is an amenable number.

42520524317661 is a deficient number, since it is larger than the sum of its proper divisors (18537486842723).

42520524317661 is a wasteful number, since it uses less digits than its factorization.

42520524317661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51773580.

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 42520524317661 in words is "forty-two trillion, five hundred twenty billion, five hundred twenty-four million, three hundred seventeen thousand, six hundred sixty-one".