40208880641 has 4 divisors (see below), whose sum is σ = 42574108932. Its totient is φ = 37843652352.

The previous prime is 40208880637. The next prime is 40208880643. The reversal of 40208880641 is 14608880204.

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 35392520641 + 4816360000 = 188129^2 + 69400^2 .

It is a cyclic number.

It is not a de Polignac number, because 40208880641 - 2² = 40208880637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40208880643) 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, 1182614120 + ... + 1182614153.

It is an arithmetic number, because the mean of its divisors is an integer number (10643527233).

Almost surely, 2^40208880641 is an apocalyptic number.

It is an amenable number.

40208880641 is a deficient number, since it is larger than the sum of its proper divisors (2365228291).

40208880641 is a wasteful number, since it uses less digits than its factorization.

40208880641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365228290.

The product of its (nonzero) digits is 98304, while the sum is 41.

The spelling of 40208880641 in words is "forty billion, two hundred eight million, eight hundred eighty thousand, six hundred forty-one".