197761261543 has 4 divisors (see below), whose sum is σ = 198866073240. Its totient is φ = 196656449848.

The previous prime is 197761261501. The next prime is 197761261547. The reversal of 197761261543 is 345162167791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345162167791 = 7 ⋅49308881113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197761261543 is a prime.

It is a super-4 number, since 4×197761261543⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197761261547) 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, 552405580 + ... + 552405937.

It is an arithmetic number, because the mean of its divisors is an integer number (49716518310).

Almost surely, 2^197761261543 is an apocalyptic number.

197761261543 is a deficient number, since it is larger than the sum of its proper divisors (1104811697).

197761261543 is a wasteful number, since it uses less digits than its factorization.

197761261543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104811696.

The product of its digits is 1905120, while the sum is 52.

The spelling of 197761261543 in words is "one hundred ninety-seven billion, seven hundred sixty-one million, two hundred sixty-one thousand, five hundred forty-three".