40231601681 has 2 divisors, whose sum is σ = 40231601682. Its totient is φ = 40231601680.

The previous prime is 40231601647. The next prime is 40231601687. The reversal of 40231601681 is 18610613204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21136507456 + 19095094225 = 145384^2 + 138185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40231601681 is a prime.

It is a super-2 number, since 2×40231601681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40231601687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20115800840 + 20115800841.

It is an arithmetic number, because the mean of its divisors is an integer number (20115800841).

Almost surely, 2^40231601681 is an apocalyptic number.

It is an amenable number.

40231601681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40231601681 is an equidigital number, since it uses as much as digits as its factorization.

40231601681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 40231601681 in words is "forty billion, two hundred thirty-one million, six hundred one thousand, six hundred eighty-one".