261444453106525 has 24 divisors (see below), whose sum is σ = 349148111300744. Its totient is φ = 193056049555200.

The previous prime is 261444453106523. The next prime is 261444453106547. The reversal of 261444453106525 is 525601354444162.

It is a happy number.

261444453106525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 144359696340484 + 117084756766041 = 12014978^2 + 10820571^2 .

It is not a de Polignac number, because 261444453106525 - 2¹ = 261444453106523 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 (261444453106523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16214394 + ... + 28032043.

Almost surely, 2^{261444453106525} is an apocalyptic number.

261444453106525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261444453106525 is a deficient number, since it is larger than the sum of its proper divisors (87703658194219).

261444453106525 is a wasteful number, since it uses less digits than its factorization.

261444453106525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44264641 (or 44264636 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 52.

The spelling of 261444453106525 in words is "two hundred sixty-one trillion, four hundred forty-four billion, four hundred fifty-three million, one hundred six thousand, five hundred twenty-five".