197121397455 has 12 divisors (see below), whose sum is σ = 341677089000. Its totient is φ = 105131411952.

The previous prime is 197121397441. The next prime is 197121397511. The reversal of 197121397455 is 554793121791.

197121397455 is a `hidden beast` number, since 1 + 97 + 1 + 2 + 13 + 97 + 455 = 666.

It is not a de Polignac number, because 197121397455 - 2⁸ = 197121397199 is a prime.

It is a super-2 number, since 2×197121397455² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2190237705 + ... + 2190237794.

It is an arithmetic number, because the mean of its divisors is an integer number (28473090750).

Almost surely, 2^197121397455 is an apocalyptic number.

197121397455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

197121397455 is a deficient number, since it is larger than the sum of its proper divisors (144555691545).

197121397455 is a wasteful number, since it uses less digits than its factorization.

197121397455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380475510 (or 4380475507 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 54.

The spelling of 197121397455 in words is "one hundred ninety-seven billion, one hundred twenty-one million, three hundred ninety-seven thousand, four hundred fifty-five".