261256054353 has 32 divisors (see below), whose sum is σ = 402071703552. Its totient is φ = 147804384000.

The previous prime is 261256054343. The next prime is 261256054379. The reversal of 261256054353 is 353450652162.

It is a happy number.

It is not a de Polignac number, because 261256054353 - 2¹⁶ = 261255988817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261256054343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2101378 + ... + 2222228.

It is an arithmetic number, because the mean of its divisors is an integer number (12564740736).

Almost surely, 2^261256054353 is an apocalyptic number.

It is an amenable number.

261256054353 is a deficient number, since it is larger than the sum of its proper divisors (140815649199).

261256054353 is a wasteful number, since it uses less digits than its factorization.

261256054353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121885.

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 261256054353 in words is "two hundred sixty-one billion, two hundred fifty-six million, fifty-four thousand, three hundred fifty-three".