263361561 has 8 divisors (see below), whose sum is σ = 354430944. Its totient is φ = 173933280.

The previous prime is 263361559. The next prime is 263361587. The reversal of 263361561 is 165163362.

263361561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 263361561 - 2¹ = 263361559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (263361061) 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, 409900 + ... + 410541.

It is an arithmetic number, because the mean of its divisors is an integer number (44303868).

Almost surely, 2^263361561 is an apocalyptic number.

It is an amenable number.

263361561 is a deficient number, since it is larger than the sum of its proper divisors (91069383).

263361561 is a wasteful number, since it uses less digits than its factorization.

263361561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820551.

The product of its digits is 19440, while the sum is 33.

The square root of 263361561 is about 16228.4183147958. The cubic root of 263361561 is about 640.9893235761.

The spelling of 263361561 in words is "two hundred sixty-three million, three hundred sixty-one thousand, five hundred sixty-one".