197635857663 has 4 divisors (see below), whose sum is σ = 263514476888. Its totient is φ = 131757238440.

The previous prime is 197635857647. The next prime is 197635857689. The reversal of 197635857663 is 366758536791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366758536791 = 3 ⋅122252845597.

It is not a de Polignac number, because 197635857663 - 2⁴ = 197635857647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197635857594 and 197635857603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197635857623) 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, 32939309608 + ... + 32939309613.

It is an arithmetic number, because the mean of its divisors is an integer number (65878619222).

Almost surely, 2^197635857663 is an apocalyptic number.

197635857663 is a deficient number, since it is larger than the sum of its proper divisors (65878619225).

197635857663 is an equidigital number, since it uses as much as digits as its factorization.

197635857663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65878619224.

The product of its digits is 171460800, while the sum is 66.

The spelling of 197635857663 in words is "one hundred ninety-seven billion, six hundred thirty-five million, eight hundred fifty-seven thousand, six hundred sixty-three".