19957035799 has 4 divisors (see below), whose sum is σ = 19965127864. Its totient is φ = 19948943736.

The previous prime is 19957035793. The next prime is 19957035823. The reversal of 19957035799 is 99753075991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99753075991 = 31 ⋅3217841161.

It is a cyclic number.

It is not a de Polignac number, because 19957035799 - 2⁵ = 19957035767 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19957035799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19957035793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4042332 + ... + 4047265.

It is an arithmetic number, because the mean of its divisors is an integer number (4991281966).

Almost surely, 2^19957035799 is an apocalyptic number.

19957035799 is a deficient number, since it is larger than the sum of its proper divisors (8092065).

19957035799 is an equidigital number, since it uses as much as digits as its factorization.

19957035799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8092064.

The product of its (nonzero) digits is 24111675, while the sum is 64.

The spelling of 19957035799 in words is "nineteen billion, nine hundred fifty-seven million, thirty-five thousand, seven hundred ninety-nine".