15990393071 has 2 divisors, whose sum is σ = 15990393072. Its totient is φ = 15990393070.

The previous prime is 15990393047. The next prime is 15990393077. The reversal of 15990393071 is 17039309951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15990393071 - 2⁶ = 15990393007 is a prime.

It is a super-2 number, since 2×15990393071² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15990393077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7995196535 + 7995196536.

It is an arithmetic number, because the mean of its divisors is an integer number (7995196536).

Almost surely, 2^15990393071 is an apocalyptic number.

15990393071 is a deficient number, since it is larger than the sum of its proper divisors (1).

15990393071 is an equidigital number, since it uses as much as digits as its factorization.

15990393071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 229635, while the sum is 47.

The spelling of 15990393071 in words is "fifteen billion, nine hundred ninety million, three hundred ninety-three thousand, seventy-one".