40744143521 has 4 divisors (see below), whose sum is σ = 40804327572. Its totient is φ = 40683959472.

The previous prime is 40744143499. The next prime is 40744143547. The reversal of 40744143521 is 12534144704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38469330496 + 2274813025 = 196136^2 + 47695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40744143521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40744143221) 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, 30091010 + ... + 30092363.

It is an arithmetic number, because the mean of its divisors is an integer number (10201081893).

Almost surely, 2^40744143521 is an apocalyptic number.

It is an amenable number.

40744143521 is a deficient number, since it is larger than the sum of its proper divisors (60184051).

40744143521 is an equidigital number, since it uses as much as digits as its factorization.

40744143521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60184050.

The product of its (nonzero) digits is 53760, while the sum is 35.

The spelling of 40744143521 in words is "forty billion, seven hundred forty-four million, one hundred forty-three thousand, five hundred twenty-one".