197297121945 has 128 divisors (see below), whose sum is σ = 397791313920. Its totient is φ = 81118298880.

The previous prime is 197297121907. The next prime is 197297121953. The reversal of 197297121945 is 549121792791.

It is not a de Polignac number, because 197297121945 - 2¹⁷ = 197296990873 is a prime.

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 127 ways as a sum of consecutive naturals, for example, 49285314 + ... + 49289316.

It is an arithmetic number, because the mean of its divisors is an integer number (3107744640).

Almost surely, 2^197297121945 is an apocalyptic number.

197297121945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197297121945 is an abundant number, since it is smaller than the sum of its proper divisors (200494191975).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197297121945 is a wasteful number, since it uses less digits than its factorization.

197297121945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475.

The product of its digits is 2857680, while the sum is 57.

The spelling of 197297121945 in words is "one hundred ninety-seven billion, two hundred ninety-seven million, one hundred twenty-one thousand, nine hundred forty-five".