39980148721 has 2 divisors, whose sum is σ = 39980148722. Its totient is φ = 39980148720.

The previous prime is 39980148673. The next prime is 39980148773. The reversal of 39980148721 is 12784108993.

It is an a-pointer prime, because the next prime (39980148773) can be obtained adding 39980148721 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37884340321 + 2095808400 = 194639^2 + 45780^2 .

It is a cyclic number.

It is not a de Polignac number, because 39980148721 - 2¹¹ = 39980146673 is a prime.

It is not a weakly prime, because it can be changed into another prime (39980148781) 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, 19990074360 + 19990074361.

It is an arithmetic number, because the mean of its divisors is an integer number (19990074361).

Almost surely, 2^39980148721 is an apocalyptic number.

It is an amenable number.

39980148721 is a deficient number, since it is larger than the sum of its proper divisors (1).

39980148721 is an equidigital number, since it uses as much as digits as its factorization.

39980148721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 39980148721 in words is "thirty-nine billion, nine hundred eighty million, one hundred forty-eight thousand, seven hundred twenty-one".