261523002048623 has 4 divisors (see below), whose sum is σ = 298883430912720. Its totient is φ = 224162573184528.

The previous prime is 261523002048611. The next prime is 261523002048743. The reversal of 261523002048623 is 326840200325162.

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

It is a cyclic number.

It is not a de Polignac number, because 261523002048623 - 2⁶ = 261523002048559 is a prime.

It is a super-2 number, since 2×261523002048623² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261523002048023) 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, 18680214432038 + ... + 18680214432051.

It is an arithmetic number, because the mean of its divisors is an integer number (74720857728180).

Almost surely, 2^{261523002048623} is an apocalyptic number.

261523002048623 is a deficient number, since it is larger than the sum of its proper divisors (37360428864097).

261523002048623 is an equidigital number, since it uses as much as digits as its factorization.

261523002048623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37360428864096.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 261523002048623 in words is "two hundred sixty-one trillion, five hundred twenty-three billion, two million, forty-eight thousand, six hundred twenty-three".