39220346681 has 2 divisors, whose sum is σ = 39220346682. Its totient is φ = 39220346680.

The previous prime is 39220346609. The next prime is 39220346707. The reversal of 39220346681 is 18664302293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32178619456 + 7041727225 = 179384^2 + 83915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39220346681 is a prime.

It is a super-2 number, since 2×39220346681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39220346981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19610173340 + 19610173341.

It is an arithmetic number, because the mean of its divisors is an integer number (19610173341).

Almost surely, 2^39220346681 is an apocalyptic number.

It is an amenable number.

39220346681 is a deficient number, since it is larger than the sum of its proper divisors (1).

39220346681 is an equidigital number, since it uses as much as digits as its factorization.

39220346681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 39220346681 in words is "thirty-nine billion, two hundred twenty million, three hundred forty-six thousand, six hundred eighty-one".