561165262251 has 8 divisors (see below), whose sum is σ = 816240381504. Its totient is φ = 340100158920.

The previous prime is 561165262247. The next prime is 561165262267. The reversal of 561165262251 is 152262561165.

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

It is not a de Polignac number, because 561165262251 - 2² = 561165262247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561165262211) 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, 8502503941 + ... + 8502504006.

It is an arithmetic number, because the mean of its divisors is an integer number (102030047688).

Almost surely, 2^561165262251 is an apocalyptic number.

561165262251 is a deficient number, since it is larger than the sum of its proper divisors (255075119253).

561165262251 is a wasteful number, since it uses less digits than its factorization.

561165262251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17005007961.

The product of its digits is 216000, while the sum is 42.

The spelling of 561165262251 in words is "five hundred sixty-one billion, one hundred sixty-five million, two hundred sixty-two thousand, two hundred fifty-one".