40008400065 has 80 divisors (see below), whose sum is σ = 75679401600. Its totient is φ = 20180337408.

The previous prime is 40008400057. The next prime is 40008400093. The reversal of 40008400065 is 56000480004.

40008400065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40008400065 - 2³ = 40008400057 is a prime.

It is a super-2 number, since 2×40008400065² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 804906 + ... + 853164.

It is an arithmetic number, because the mean of its divisors is an integer number (945992520).

Almost surely, 2^40008400065 is an apocalyptic number.

40008400065 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40008400065 is a deficient number, since it is larger than the sum of its proper divisors (35671001535).

40008400065 is a wasteful number, since it uses less digits than its factorization.

40008400065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48388 (or 48379 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 40008400065 its reverse (56000480004), we get a palindrome (96008880069).

The spelling of 40008400065 in words is "forty billion, eight million, four hundred thousand, sixty-five".