261608207163 has 8 divisors (see below), whose sum is σ = 348818108688. Its totient is φ = 174401888544.

The previous prime is 261608207137. The next prime is 261608207239. The reversal of 261608207163 is 361702806162.

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

It is not a de Polignac number, because 261608207163 - 2¹⁸ = 261607945019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261608207123) 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, 720456 + ... + 1020917.

It is an arithmetic number, because the mean of its divisors is an integer number (43602263586).

Almost surely, 2^261608207163 is an apocalyptic number.

261608207163 is a deficient number, since it is larger than the sum of its proper divisors (87209901525).

261608207163 is a wasteful number, since it uses less digits than its factorization.

261608207163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791453.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 261608207163 in words is "two hundred sixty-one billion, six hundred eight million, two hundred seven thousand, one hundred sixty-three".