261245072159 has 4 divisors (see below), whose sum is σ = 261246148416. Its totient is φ = 261243995904.

The previous prime is 261245072149. The next prime is 261245072191. The reversal of 261245072159 is 951270542162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 261245072159 - 2¹⁶ = 261245006623 is a prime.

It is a super-2 number, since 2×261245072159² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261245072119) 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, 16562 + ... + 723024.

It is an arithmetic number, because the mean of its divisors is an integer number (65311537104).

Almost surely, 2^261245072159 is an apocalyptic number.

261245072159 is a deficient number, since it is larger than the sum of its proper divisors (1076257).

261245072159 is an equidigital number, since it uses as much as digits as its factorization.

261245072159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076256.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 261245072159 in words is "two hundred sixty-one billion, two hundred forty-five million, seventy-two thousand, one hundred fifty-nine".