261647522410245 has 32 divisors (see below), whose sum is σ = 432415498788864. Its totient is φ = 134957921697600.

The previous prime is 261647522410231. The next prime is 261647522410249. The reversal of 261647522410245 is 542014225746162.

It is not a de Polignac number, because 261647522410245 - 2¹⁷ = 261647522279173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261647522410249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178353777 + ... + 179814806.

It is an arithmetic number, because the mean of its divisors is an integer number (13512984337152).

Almost surely, 2^{261647522410245} is an apocalyptic number.

It is an amenable number.

261647522410245 is a deficient number, since it is larger than the sum of its proper divisors (170767976378619).

261647522410245 is a wasteful number, since it uses less digits than its factorization.

261647522410245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358170193.

The product of its (nonzero) digits is 6451200, while the sum is 51.

The spelling of 261647522410245 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, five hundred twenty-two million, four hundred ten thousand, two hundred forty-five".