42521466561 has 8 divisors (see below), whose sum is σ = 64794615744. Its totient is φ = 24297980880.

The previous prime is 42521466527. The next prime is 42521466569. The reversal of 42521466561 is 16566412524.

42521466561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42521466561 - 2¹⁴ = 42521450177 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (42521466569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012415850 + ... + 1012415891.

It is an arithmetic number, because the mean of its divisors is an integer number (8099326968).

Almost surely, 2^42521466561 is an apocalyptic number.

It is an amenable number.

42521466561 is a deficient number, since it is larger than the sum of its proper divisors (22273149183).

42521466561 is a wasteful number, since it uses less digits than its factorization.

42521466561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024831751.

The product of its digits is 345600, while the sum is 42.

The spelling of 42521466561 in words is "forty-two billion, five hundred twenty-one million, four hundred sixty-six thousand, five hundred sixty-one".