19736194197 has 32 divisors (see below), whose sum is σ = 28078489600. Its totient is φ = 12294929088.

The previous prime is 19736194193. The next prime is 19736194211. The reversal of 19736194197 is 79149163791.

It is not a de Polignac number, because 19736194197 - 2² = 19736194193 is a prime.

It is a super-2 number, since 2×19736194197² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19736194193) 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 in 31 ways as a sum of consecutive naturals, for example, 7054803 + ... + 7057599.

It is an arithmetic number, because the mean of its divisors is an integer number (877452800).

Almost surely, 2^19736194197 is an apocalyptic number.

It is an amenable number.

19736194197 is a deficient number, since it is larger than the sum of its proper divisors (8342295403).

19736194197 is a wasteful number, since it uses less digits than its factorization.

19736194197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465.

The product of its digits is 2571912, while the sum is 57.

The spelling of 19736194197 in words is "nineteen billion, seven hundred thirty-six million, one hundred ninety-four thousand, one hundred ninety-seven".