197196821855 has 16 divisors (see below), whose sum is σ = 258173180928. Its totient is φ = 143402196000.

The previous prime is 197196821851. The next prime is 197196821879. The reversal of 197196821855 is 558128691791.

It is not a de Polignac number, because 197196821855 - 2² = 197196821851 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 (197196821851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430190 + ... + 761220.

It is an arithmetic number, because the mean of its divisors is an integer number (16135823808).

Almost surely, 2^197196821855 is an apocalyptic number.

197196821855 is a deficient number, since it is larger than the sum of its proper divisors (60976359073).

197196821855 is a wasteful number, since it uses less digits than its factorization.

197196821855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341878.

The product of its digits is 10886400, while the sum is 62.

The spelling of 197196821855 in words is "one hundred ninety-seven billion, one hundred ninety-six million, eight hundred twenty-one thousand, eight hundred fifty-five".