39920618873 has 2 divisors, whose sum is σ = 39920618874. Its totient is φ = 39920618872.

The previous prime is 39920618867. The next prime is 39920618929. The reversal of 39920618873 is 37881602993.

It is an a-pointer prime, because the next prime (39920618929) can be obtained adding 39920618873 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38697578089 + 1223040784 = 196717^2 + 34972^2 .

It is a cyclic number.

It is not a de Polignac number, because 39920618873 - 2²⁰ = 39919570297 is a prime.

It is a super-2 number, since 2×39920618873² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39920618833) 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, 19960309436 + 19960309437.

It is an arithmetic number, because the mean of its divisors is an integer number (19960309437).

Almost surely, 2^39920618873 is an apocalyptic number.

It is an amenable number.

39920618873 is a deficient number, since it is larger than the sum of its proper divisors (1).

39920618873 is an equidigital number, since it uses as much as digits as its factorization.

39920618873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 39920618873 in words is "thirty-nine billion, nine hundred twenty million, six hundred eighteen thousand, eight hundred seventy-three".