40440513521 has 8 divisors (see below), whose sum is σ = 41309484840. Its totient is φ = 39575466112.

The previous prime is 40440513517. The next prime is 40440513523. The reversal of 40440513521 is 12531504404.

40440513521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13915505296 + 26525008225 = 117964^2 + 162865^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40440513521 - 2² = 40440513517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40440513523) 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, 960140 + ... + 1001373.

It is an arithmetic number, because the mean of its divisors is an integer number (5163685605).

Almost surely, 2^40440513521 is an apocalyptic number.

It is an amenable number.

40440513521 is a deficient number, since it is larger than the sum of its proper divisors (868971319).

40440513521 is a wasteful number, since it uses less digits than its factorization.

40440513521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961955.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 40440513521 in words is "forty billion, four hundred forty million, five hundred thirteen thousand, five hundred twenty-one".