39478475681 has 2 divisors, whose sum is σ = 39478475682. Its totient is φ = 39478475680.

The previous prime is 39478475677. The next prime is 39478475693. The reversal of 39478475681 is 18657487493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26577150625 + 12901325056 = 163025^2 + 113584^2 .

It is a cyclic number.

It is not a de Polignac number, because 39478475681 - 2² = 39478475677 is a prime.

It is a super-2 number, since 2×39478475681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39478475651) 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, 19739237840 + 19739237841.

It is an arithmetic number, because the mean of its divisors is an integer number (19739237841).

Almost surely, 2^39478475681 is an apocalyptic number.

It is an amenable number.

39478475681 is a deficient number, since it is larger than the sum of its proper divisors (1).

39478475681 is an equidigital number, since it uses as much as digits as its factorization.

39478475681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 62.

The spelling of 39478475681 in words is "thirty-nine billion, four hundred seventy-eight million, four hundred seventy-five thousand, six hundred eighty-one".