40121316865 has 48 divisors (see below), whose sum is σ = 58262846400. Its totient is φ = 26413844352.

The previous prime is 40121316841. The next prime is 40121316881. The reversal of 40121316865 is 56861312104.

It is a happy number.

It is not a de Polignac number, because 40121316865 - 2⁷ = 40121316737 is a prime.

It is a super-3 number, since 3×40121316865³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1256022 + ... + 1287568.

It is an arithmetic number, because the mean of its divisors is an integer number (1213809300).

Almost surely, 2^40121316865 is an apocalyptic number.

It is an amenable number.

40121316865 is a deficient number, since it is larger than the sum of its proper divisors (18141529535).

40121316865 is a wasteful number, since it uses less digits than its factorization.

40121316865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31774 (or 31767 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

Adding to 40121316865 its reverse (56861312104), we get a palindrome (96982628969).

The spelling of 40121316865 in words is "forty billion, one hundred twenty-one million, three hundred sixteen thousand, eight hundred sixty-five".