261535126623053 has 4 divisors (see below), whose sum is σ = 262890230906268. Its totient is φ = 260180022339840.

The previous prime is 261535126622981. The next prime is 261535126623103. The reversal of 261535126623053 is 350326621535162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 109242694397929 + 152292432225124 = 10451923^2 + 12340682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261535126623053 is a prime.

It is a super-2 number, since 2×261535126623053² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261535126622992 and 261535126623010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261535126673053) 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, 677552141318 + ... + 677552141703.

It is an arithmetic number, because the mean of its divisors is an integer number (65722557726567).

Almost surely, 2^{261535126623053} is an apocalyptic number.

It is an amenable number.

261535126623053 is a deficient number, since it is larger than the sum of its proper divisors (1355104283215).

261535126623053 is a wasteful number, since it uses less digits than its factorization.

261535126623053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355104283214.

The product of its (nonzero) digits is 5832000, while the sum is 50.

The spelling of 261535126623053 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred twenty-six million, six hundred twenty-three thousand, fifty-three".