261553772162341 has 4 divisors (see below), whose sum is σ = 261566573992384. Its totient is φ = 261540970332300.

The previous prime is 261553772162269. The next prime is 261553772162357. The reversal of 261553772162341 is 143261277355162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261553772162341 - 2¹³ = 261553772154149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261553772162141) 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, 6400884375 + ... + 6400925236.

It is an arithmetic number, because the mean of its divisors is an integer number (65391643498096).

Almost surely, 2^{261553772162341} is an apocalyptic number.

It is an amenable number.

261553772162341 is a deficient number, since it is larger than the sum of its proper divisors (12801830043).

261553772162341 is a wasteful number, since it uses less digits than its factorization.

261553772162341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12801830042.

The product of its digits is 12700800, while the sum is 55.

The spelling of 261553772162341 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, seven hundred seventy-two million, one hundred sixty-two thousand, three hundred forty-one".