261440572056133 has 4 divisors (see below), whose sum is σ = 267520585359808. Its totient is φ = 255360558752460.

The previous prime is 261440572056101. The next prime is 261440572056137. The reversal of 261440572056133 is 331650275044162.

261440572056133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 261440572056133 - 2⁵ = 261440572056101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261440572056137) 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, 3040006651773 + ... + 3040006651858.

It is an arithmetic number, because the mean of its divisors is an integer number (66880146339952).

Almost surely, 2^{261440572056133} is an apocalyptic number.

It is an amenable number.

261440572056133 is a deficient number, since it is larger than the sum of its proper divisors (6080013303675).

261440572056133 is an equidigital number, since it uses as much as digits as its factorization.

261440572056133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080013303674.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 261440572056133 in words is "two hundred sixty-one trillion, four hundred forty billion, five hundred seventy-two million, fifty-six thousand, one hundred thirty-three".