261550463 has 4 divisors (see below), whose sum is σ = 261592560. Its totient is φ = 261508368.

The previous prime is 261550453. The next prime is 261550477. The reversal of 261550463 is 364055162.

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

It is a cyclic number.

It is not a de Polignac number, because 261550463 - 2⁸ = 261550207 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 (261550453) 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, 9683 + ... + 24836.

It is an arithmetic number, because the mean of its divisors is an integer number (65398140).

Almost surely, 2^261550463 is an apocalyptic number.

261550463 is a deficient number, since it is larger than the sum of its proper divisors (42097).

261550463 is an equidigital number, since it uses as much as digits as its factorization.

261550463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42096.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 261550463 is about 16172.5218503485. The cubic root of 261550463 is about 639.5166133469.

The spelling of 261550463 in words is "two hundred sixty-one million, five hundred fifty thousand, four hundred sixty-three".