261533465545231 has 32 divisors (see below), whose sum is σ = 305769347366400. Its totient is φ = 221267366052480.

The previous prime is 261533465545171. The next prime is 261533465545291. The reversal of 261533465545231 is 132545564335162.

It is an interprime number because it is at equal distance from previous prime (261533465545171) and next prime (261533465545291).

It is not a de Polignac number, because 261533465545231 - 2¹⁹ = 261533465020943 is a prime.

It is a super-2 number, since 2×261533465545231² (a number of 30 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 (261533465545291) 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, 330413085 + ... + 331203673.

It is an arithmetic number, because the mean of its divisors is an integer number (9555292105200).

Almost surely, 2^{261533465545231} is an apocalyptic number.

261533465545231 is a deficient number, since it is larger than the sum of its proper divisors (44235881821169).

261533465545231 is a wasteful number, since it uses less digits than its factorization.

261533465545231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825999.

The product of its digits is 38880000, while the sum is 55.

The spelling of 261533465545231 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, four hundred sixty-five million, five hundred forty-five thousand, two hundred thirty-one".