19578763197 has 12 divisors (see below), whose sum is σ = 32320498080. Its totient is φ = 11187864648.

The previous prime is 19578763181. The next prime is 19578763207. The reversal of 19578763197 is 79136787591.

It is not a de Polignac number, because 19578763197 - 2⁴ = 19578763181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 310774019 = 19578763197 / (1 + 9 + 5 + 7 + 8 + 7 + 6 + 3 + 1 + 9 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19578763147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155386947 + ... + 155387072.

It is an arithmetic number, because the mean of its divisors is an integer number (2693374840).

Almost surely, 2^19578763197 is an apocalyptic number.

It is an amenable number.

19578763197 is a deficient number, since it is larger than the sum of its proper divisors (12741734883).

19578763197 is a wasteful number, since it uses less digits than its factorization.

19578763197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310774032 (or 310774029 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 63.

The spelling of 19578763197 in words is "nineteen billion, five hundred seventy-eight million, seven hundred sixty-three thousand, one hundred ninety-seven".