261603605713 has 8 divisors (see below), whose sum is σ = 278857942400. Its totient is φ = 244697841648.

The previous prime is 261603605657. The next prime is 261603605723. The reversal of 261603605713 is 317506306162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261603605713 - 2¹⁷ = 261603474641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261603605723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87141606 + ... + 87144607.

It is an arithmetic number, because the mean of its divisors is an integer number (34857242800).

Almost surely, 2^261603605713 is an apocalyptic number.

It is an amenable number.

261603605713 is a deficient number, since it is larger than the sum of its proper divisors (17254336687).

261603605713 is a wasteful number, since it uses less digits than its factorization.

261603605713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174286311.

The product of its (nonzero) digits is 136080, while the sum is 40.

The spelling of 261603605713 in words is "two hundred sixty-one billion, six hundred three million, six hundred five thousand, seven hundred thirteen".