40391861717 has 4 divisors (see below), whose sum is σ = 40615021356. Its totient is φ = 40168702080.

The previous prime is 40391861681. The next prime is 40391861737. The reversal of 40391861717 is 71716819304.

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 5911456996 + 34480404721 = 76886^2 + 185689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40391861717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40391861737) 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, 111579548 + ... + 111579909.

It is an arithmetic number, because the mean of its divisors is an integer number (10153755339).

Almost surely, 2^40391861717 is an apocalyptic number.

It is an amenable number.

40391861717 is a deficient number, since it is larger than the sum of its proper divisors (223159639).

40391861717 is a wasteful number, since it uses less digits than its factorization.

40391861717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223159638.

The product of its (nonzero) digits is 254016, while the sum is 47.

The spelling of 40391861717 in words is "forty billion, three hundred ninety-one million, eight hundred sixty-one thousand, seven hundred seventeen".