261332050513 has 4 divisors (see below), whose sum is σ = 262080853300. Its totient is φ = 260583247728.

The previous prime is 261332050501. The next prime is 261332050543. The reversal of 261332050513 is 315050233162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142202147409 + 119129903104 = 377097^2 + 345152^2 .

It is a cyclic number.

It is not a de Polignac number, because 261332050513 - 2³³ = 252742115921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261332050543) 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, 374400870 + ... + 374401567.

It is an arithmetic number, because the mean of its divisors is an integer number (65520213325).

Almost surely, 2^261332050513 is an apocalyptic number.

It is an amenable number.

261332050513 is a deficient number, since it is larger than the sum of its proper divisors (748802787).

261332050513 is an equidigital number, since it uses as much as digits as its factorization.

261332050513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748802786.

The product of its (nonzero) digits is 16200, while the sum is 31.

Adding to 261332050513 its reverse (315050233162), we get a palindrome (576382283675).

The spelling of 261332050513 in words is "two hundred sixty-one billion, three hundred thirty-two million, fifty thousand, five hundred thirteen".