197690449786 has 8 divisors (see below), whose sum is σ = 299471671764. Its totient is φ = 97866559200.

The previous prime is 197690449763. The next prime is 197690449787. The reversal of 197690449786 is 687944096791.

It can be written as a sum of positive squares in 2 ways, for example, as 123671085561 + 74019364225 = 351669^2 + 272065^2 .

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

It is not an unprimeable number, because it can be changed into a prime (197690449787) 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, 489332595 + ... + 489332998.

Almost surely, 2^197690449786 is an apocalyptic number.

197690449786 is a deficient number, since it is larger than the sum of its proper divisors (101781221978).

197690449786 is a wasteful number, since it uses less digits than its factorization.

197690449786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978665696.

The product of its (nonzero) digits is 164602368, while the sum is 70.

The spelling of 197690449786 in words is "one hundred ninety-seven billion, six hundred ninety million, four hundred forty-nine thousand, seven hundred eighty-six".