197853922491 has 4 divisors (see below), whose sum is σ = 263805229992. Its totient is φ = 131902614992.

The previous prime is 197853922489. The next prime is 197853922523. The reversal of 197853922491 is 194229358791.

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 197853922491 - 2¹ = 197853922489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197853922691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32975653746 + ... + 32975653751.

It is an arithmetic number, because the mean of its divisors is an integer number (65951307498).

Almost surely, 2^197853922491 is an apocalyptic number.

197853922491 is a deficient number, since it is larger than the sum of its proper divisors (65951307501).

197853922491 is an equidigital number, since it uses as much as digits as its factorization.

197853922491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65951307500.

The product of its digits is 9797760, while the sum is 60.

The spelling of 197853922491 in words is "one hundred ninety-seven billion, eight hundred fifty-three million, nine hundred twenty-two thousand, four hundred ninety-one".