261432130515423 has 16 divisors (see below), whose sum is σ = 398437409930496. Its totient is φ = 149365549008000.

The previous prime is 261432130515377. The next prime is 261432130515449. The reversal of 261432130515423 is 324515031234162.

It is not a de Polignac number, because 261432130515423 - 2⁹ = 261432130514911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261432135515423) 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, 1009861578 + ... + 1010120423.

It is an arithmetic number, because the mean of its divisors is an integer number (24902338120656).

Almost surely, 2^{261432130515423} is an apocalyptic number.

261432130515423 is a deficient number, since it is larger than the sum of its proper divisors (137005279415073).

261432130515423 is a wasteful number, since it uses less digits than its factorization.

261432130515423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019988174.

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 261432130515423 its reverse (324515031234162), we get a palindrome (585947161749585).

The spelling of 261432130515423 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, one hundred thirty million, five hundred fifteen thousand, four hundred twenty-three".