40644175517 has 12 divisors (see below), whose sum is σ = 44686648188. Its totient is φ = 36939619200.

The previous prime is 40644175513. The next prime is 40644175549. The reversal of 40644175517 is 71557144604.

It can be written as a sum of positive squares in 2 ways, for example, as 24722530756 + 15921644761 = 157234^2 + 126181^2 .

It is not a de Polignac number, because 40644175517 - 2² = 40644175513 is a prime.

It is a super-3 number, since 3×40644175517³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644175511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444773 + ... + 528309.

It is an arithmetic number, because the mean of its divisors is an integer number (3723887349).

Almost surely, 2^40644175517 is an apocalyptic number.

It is an amenable number.

40644175517 is a deficient number, since it is larger than the sum of its proper divisors (4042472671).

40644175517 is a wasteful number, since it uses less digits than its factorization.

40644175517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87580 (or 87569 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 40644175517 in words is "forty billion, six hundred forty-four million, one hundred seventy-five thousand, five hundred seventeen".