197861553856 has 28 divisors (see below), whose sum is σ = 392689308600. Its totient is φ = 98916216320.

The previous prime is 197861553853. The next prime is 197861553893. The reversal of 197861553856 is 658355168791.

197861553856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is not an unprimeable number, because it can be changed into a prime (197861553853) 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, 217476 + ... + 665596.

Almost surely, 2^197861553856 is an apocalyptic number.

197861553856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

197861553856 is a deficient number, since it is larger than the sum of its proper divisors (194827754744).

197861553856 is an equidigital number, since it uses as much as digits as its factorization.

197861553856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455032 (or 455022 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 64.

The spelling of 197861553856 in words is "one hundred ninety-seven billion, eight hundred sixty-one million, five hundred fifty-three thousand, eight hundred fifty-six".