261641553595 has 4 divisors (see below), whose sum is σ = 313969864320. Its totient is φ = 209313242872.

The previous prime is 261641553497. The next prime is 261641553623. The reversal of 261641553595 is 595355146162.

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

It is a cyclic number.

It is not a de Polignac number, because 261641553595 - 2¹¹ = 261641551547 is a prime.

It is a super-3 number, since 3×261641553595³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26164155355 + ... + 26164155364.

It is an arithmetic number, because the mean of its divisors is an integer number (78492466080).

Almost surely, 2^261641553595 is an apocalyptic number.

261641553595 is a deficient number, since it is larger than the sum of its proper divisors (52328310725).

261641553595 is an equidigital number, since it uses as much as digits as its factorization.

261641553595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52328310724.

The product of its digits is 4860000, while the sum is 52.

The spelling of 261641553595 in words is "two hundred sixty-one billion, six hundred forty-one million, five hundred fifty-three thousand, five hundred ninety-five".