261484199693 has 4 divisors (see below), whose sum is σ = 261682145148. Its totient is φ = 261286254240.

The previous prime is 261484199677. The next prime is 261484199701. The reversal of 261484199693 is 396991484162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175940819209 + 85543380484 = 419453^2 + 292478^2 .

It is a cyclic number.

It is not a de Polignac number, because 261484199693 - 2⁴ = 261484199677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261484199293) 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, 98970746 + ... + 98973387.

It is an arithmetic number, because the mean of its divisors is an integer number (65420536287).

Almost surely, 2^261484199693 is an apocalyptic number.

It is an amenable number.

261484199693 is a deficient number, since it is larger than the sum of its proper divisors (197945455).

261484199693 is a wasteful number, since it uses less digits than its factorization.

261484199693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197945454.

The product of its digits is 20155392, while the sum is 62.

The spelling of 261484199693 in words is "two hundred sixty-one billion, four hundred eighty-four million, one hundred ninety-nine thousand, six hundred ninety-three".