40399968571 has 4 divisors (see below), whose sum is σ = 40953392872. Its totient is φ = 39846544272.

The previous prime is 40399968551. The next prime is 40399968577. The reversal of 40399968571 is 17586999304.

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

It is a cyclic number.

It is not a de Polignac number, because 40399968571 - 2¹³ = 40399960379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40399968577) 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, 276712041 + ... + 276712186.

It is an arithmetic number, because the mean of its divisors is an integer number (10238348218).

Almost surely, 2^40399968571 is an apocalyptic number.

40399968571 is a deficient number, since it is larger than the sum of its proper divisors (553424301).

40399968571 is an equidigital number, since it uses as much as digits as its factorization.

40399968571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553424300.

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 40399968571 in words is "forty billion, three hundred ninety-nine million, nine hundred sixty-eight thousand, five hundred seventy-one".