40051523521 has 4 divisors (see below), whose sum is σ = 40133095344. Its totient is φ = 39969951700.

The previous prime is 40051523513. The next prime is 40051523527. The reversal of 40051523521 is 12532515004.

40051523521 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 40051523521 - 2³ = 40051523513 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 40051523521.

It is not an unprimeable number, because it can be changed into a prime (40051523527) 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, 40785175 + ... + 40786156.

It is an arithmetic number, because the mean of its divisors is an integer number (10033273836).

Almost surely, 2^40051523521 is an apocalyptic number.

It is an amenable number.

40051523521 is a deficient number, since it is larger than the sum of its proper divisors (81571823).

40051523521 is an equidigital number, since it uses as much as digits as its factorization.

40051523521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81571822.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 40051523521 in words is "forty billion, fifty-one million, five hundred twenty-three thousand, five hundred twenty-one".