261552445031323 has 16 divisors (see below), whose sum is σ = 277532750628864. Its totient is φ = 245638331326080.

The previous prime is 261552445031321. The next prime is 261552445031369. The reversal of 261552445031323 is 323130544255162.

It is a cyclic number.

It is not a de Polignac number, because 261552445031323 - 2¹ = 261552445031321 is a prime.

It is a super-2 number, since 2×261552445031323² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261552445031321) 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, 86494518 + ... + 89467348.

It is an arithmetic number, because the mean of its divisors is an integer number (17345796914304).

Almost surely, 2^{261552445031323} is an apocalyptic number.

261552445031323 is a deficient number, since it is larger than the sum of its proper divisors (15980305597541).

261552445031323 is a wasteful number, since it uses less digits than its factorization.

261552445031323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983962.

The product of its (nonzero) digits is 2592000, while the sum is 46.

Adding to 261552445031323 its reverse (323130544255162), we get a palindrome (584682989286485).

The spelling of 261552445031323 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, four hundred forty-five million, thirty-one thousand, three hundred twenty-three".