260765331661 has 4 divisors (see below), whose sum is σ = 260793688000. Its totient is φ = 260736975324.

The previous prime is 260765331643. The next prime is 260765331689. The reversal of 260765331661 is 166133567062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 260765331661 - 2²¹ = 260763234509 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 (260765331611) 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, 14164371 + ... + 14182768.

It is an arithmetic number, because the mean of its divisors is an integer number (65198422000).

Almost surely, 2^260765331661 is an apocalyptic number.

It is an amenable number.

260765331661 is a deficient number, since it is larger than the sum of its proper divisors (28356339).

260765331661 is an equidigital number, since it uses as much as digits as its factorization.

260765331661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28356338.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 260765331661 in words is "two hundred sixty billion, seven hundred sixty-five million, three hundred thirty-one thousand, six hundred sixty-one".