19990597071 has 8 divisors (see below), whose sum is σ = 26662495104. Its totient is φ = 13322881880.

The previous prime is 19990597049. The next prime is 19990597073. The reversal of 19990597071 is 17079509991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19990597071 - 2¹⁸ = 19990334927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990597073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034541 + ... + 1053686.

It is an arithmetic number, because the mean of its divisors is an integer number (3332811888).

Almost surely, 2^19990597071 is an apocalyptic number.

19990597071 is a deficient number, since it is larger than the sum of its proper divisors (6671898033).

19990597071 is a wasteful number, since it uses less digits than its factorization.

19990597071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091421.

The product of its (nonzero) digits is 1607445, while the sum is 57.

The spelling of 19990597071 in words is "nineteen billion, nine hundred ninety million, five hundred ninety-seven thousand, seventy-one".