40808681737 has 4 divisors (see below), whose sum is σ = 40810871556. Its totient is φ = 40806491920.

The previous prime is 40808681717. The next prime is 40808681761. The reversal of 40808681737 is 73718680804.

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 19171448521 + 21637233216 = 138461^2 + 147096^2 .

It is a cyclic number.

It is not a de Polignac number, because 40808681737 - 2³¹ = 38661198089 is a prime.

It is a super-2 number, since 2×40808681737² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40808681717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066714 + ... + 1104307.

It is an arithmetic number, because the mean of its divisors is an integer number (10202717889).

Almost surely, 2^40808681737 is an apocalyptic number.

It is an amenable number.

40808681737 is a deficient number, since it is larger than the sum of its proper divisors (2189819).

40808681737 is a wasteful number, since it uses less digits than its factorization.

40808681737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189818.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 40808681737 in words is "forty billion, eight hundred eight million, six hundred eighty-one thousand, seven hundred thirty-seven".