197466887491 has 2 divisors, whose sum is σ = 197466887492. Its totient is φ = 197466887490.

The previous prime is 197466887479. The next prime is 197466887521. The reversal of 197466887491 is 194788664791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197466887491 - 2¹¹ = 197466885443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197466887491.

It is not a weakly prime, because it can be changed into another prime (197466887461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98733443745 + 98733443746.

It is an arithmetic number, because the mean of its divisors is an integer number (98733443746).

Almost surely, 2^197466887491 is an apocalyptic number.

197466887491 is a deficient number, since it is larger than the sum of its proper divisors (1).

197466887491 is an equidigital number, since it uses as much as digits as its factorization.

197466887491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146313216, while the sum is 70.

The spelling of 197466887491 in words is "one hundred ninety-seven billion, four hundred sixty-six million, eight hundred eighty-seven thousand, four hundred ninety-one".