261553175036473 has 4 divisors (see below), whose sum is σ = 275319131617360. Its totient is φ = 247787218455588.

The previous prime is 261553175036401. The next prime is 261553175036497. The reversal of 261553175036473 is 374630571355162.

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 261553175036473 - 2⁹ = 261553175035961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261553175036273) 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, 6882978290415 + ... + 6882978290452.

It is an arithmetic number, because the mean of its divisors is an integer number (68829782904340).

Almost surely, 2^{261553175036473} is an apocalyptic number.

It is an amenable number.

261553175036473 is a deficient number, since it is larger than the sum of its proper divisors (13765956580887).

261553175036473 is a wasteful number, since it uses less digits than its factorization.

261553175036473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13765956580886.

The product of its (nonzero) digits is 47628000, while the sum is 58.

The spelling of 261553175036473 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, one hundred seventy-five million, thirty-six thousand, four hundred seventy-three".