197887630639 has 4 divisors (see below), whose sum is σ = 198169924680. Its totient is φ = 197605336600.

The previous prime is 197887630631. The next prime is 197887630669. The reversal of 197887630639 is 936036788791.

197887630639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 197887630639 - 2³ = 197887630631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197887630631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141145969 + ... + 141147370.

It is an arithmetic number, because the mean of its divisors is an integer number (49542481170).

Almost surely, 2^197887630639 is an apocalyptic number.

197887630639 is a deficient number, since it is larger than the sum of its proper divisors (282294041).

197887630639 is an equidigital number, since it uses as much as digits as its factorization.

197887630639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282294040.

The product of its (nonzero) digits is 82301184, while the sum is 67.

The spelling of 197887630639 in words is "one hundred ninety-seven billion, eight hundred eighty-seven million, six hundred thirty thousand, six hundred thirty-nine".