261572057653 has 8 divisors (see below), whose sum is σ = 264180271320. Its totient is φ = 258964204800.

The previous prime is 261572057623. The next prime is 261572057711. The reversal of 261572057653 is 356750275162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 145040628964 + 116531428689 = 380842^2 + 341367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261572057653 - 2²⁵ = 261538503221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261572057597 and 261572057606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261572057623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1507153 + ... + 1671721.

It is an arithmetic number, because the mean of its divisors is an integer number (33022533915).

Almost surely, 2^261572057653 is an apocalyptic number.

It is an amenable number.

261572057653 is a deficient number, since it is larger than the sum of its proper divisors (2608213667).

261572057653 is a wasteful number, since it uses less digits than its factorization.

261572057653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180407.

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 261572057653 in words is "two hundred sixty-one billion, five hundred seventy-two million, fifty-seven thousand, six hundred fifty-three".