197497787794791 has 48 divisors (see below), whose sum is σ = 289935379703424. Its totient is φ = 119493285912000.

The previous prime is 197497787794757. The next prime is 197497787794799.

It is a happy number.

197497787794791 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-197497787794791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197497787794799) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 750322636 + ... + 750585806.

It is an arithmetic number, because the mean of its divisors is an integer number (6040320410488).

Almost surely, 2^{197497787794791} is an apocalyptic number.

197497787794791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197497787794791 is a deficient number, since it is larger than the sum of its proper divisors (92437591908633).

197497787794791 is a wasteful number, since it uses less digits than its factorization.

197497787794791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266684 (or 266673 counting only the distinct ones).

The product of its digits is 98802571392, while the sum is 96.

The spelling of 197497787794791 in words is "one hundred ninety-seven trillion, four hundred ninety-seven billion, seven hundred eighty-seven million, seven hundred ninety-four thousand, seven hundred ninety-one".