261245440245 has 16 divisors (see below), whose sum is σ = 418013904960. Its totient is φ = 139323834624.

The previous prime is 261245440213. The next prime is 261245440249. The reversal of 261245440245 is 542044542162.

It is not a de Polignac number, because 261245440245 - 2⁵ = 261245440213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261245440249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128935 + ... + 734244.

It is an arithmetic number, because the mean of its divisors is an integer number (26125869060).

Almost surely, 2^261245440245 is an apocalyptic number.

It is an amenable number.

261245440245 is a deficient number, since it is larger than the sum of its proper divisors (156768464715).

261245440245 is a wasteful number, since it uses less digits than its factorization.

261245440245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883364.

The product of its (nonzero) digits is 307200, while the sum is 39.

The spelling of 261245440245 in words is "two hundred sixty-one billion, two hundred forty-five million, four hundred forty thousand, two hundred forty-five".