40688623897 has 2 divisors, whose sum is σ = 40688623898. Its totient is φ = 40688623896.

The previous prime is 40688623879. The next prime is 40688623933. The reversal of 40688623897 is 79832688604.

Together with previous prime (40688623879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28229376256 + 12459247641 = 168016^2 + 111621^2 .

It is a cyclic number.

It is not a de Polignac number, because 40688623897 - 2¹¹ = 40688621849 is a prime.

It is a super-2 number, since 2×40688623897² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40688623397) by changing a digit.

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 as a sum of consecutive naturals, namely, 20344311948 + 20344311949.

It is an arithmetic number, because the mean of its divisors is an integer number (20344311949).

Almost surely, 2^40688623897 is an apocalyptic number.

It is an amenable number.

40688623897 is a deficient number, since it is larger than the sum of its proper divisors (1).

40688623897 is an equidigital number, since it uses as much as digits as its factorization.

40688623897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 40688623897 in words is "forty billion, six hundred eighty-eight million, six hundred twenty-three thousand, eight hundred ninety-seven".