15990393077 has 2 divisors, whose sum is σ = 15990393078. Its totient is φ = 15990393076.

The previous prime is 15990393071. The next prime is 15990393079. The reversal of 15990393077 is 77039309951.

15990393077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10001800081 + 5988592996 = 100009^2 + 77386^2 .

It is a cyclic number.

It is not a de Polignac number, because 15990393077 - 2¹⁰ = 15990392053 is a prime.

Together with 15990393079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15990393071) 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, 7995196538 + 7995196539.

It is an arithmetic number, because the mean of its divisors is an integer number (7995196539).

Almost surely, 2^15990393077 is an apocalyptic number.

It is an amenable number.

15990393077 is a deficient number, since it is larger than the sum of its proper divisors (1).

15990393077 is an equidigital number, since it uses as much as digits as its factorization.

15990393077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1607445, while the sum is 53.

The spelling of 15990393077 in words is "fifteen billion, nine hundred ninety million, three hundred ninety-three thousand, seventy-seven".