261560316601 has 4 divisors (see below), whose sum is σ = 263021547600. Its totient is φ = 260099085604.

The previous prime is 261560316583. The next prime is 261560316659. The reversal of 261560316601 is 106613065162.

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 261560316601 - 2¹⁷ = 261560185529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261560310601) 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, 730615231 + ... + 730615588.

It is an arithmetic number, because the mean of its divisors is an integer number (65755386900).

Almost surely, 2^261560316601 is an apocalyptic number.

It is an amenable number.

261560316601 is a deficient number, since it is larger than the sum of its proper divisors (1461230999).

261560316601 is a wasteful number, since it uses less digits than its factorization.

261560316601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461230998.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 261560316601 in words is "two hundred sixty-one billion, five hundred sixty million, three hundred sixteen thousand, six hundred one".