261675155555611 has 32 divisors (see below), whose sum is σ = 319067104858112. Its totient is φ = 209846138935680.

The previous prime is 261675155555603. The next prime is 261675155555647. The reversal of 261675155555611 is 116555551576162.

It is a cyclic number.

It is not a de Polignac number, because 261675155555611 - 2³ = 261675155555603 is a prime.

It is a super-2 number, since 2×261675155555611² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261675155555611.

It is not an unprimeable number, because it can be changed into a prime (261675155555111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102533241 + ... + 105054346.

It is an arithmetic number, because the mean of its divisors is an integer number (9970847026816).

Almost surely, 2^{261675155555611} is an apocalyptic number.

261675155555611 is a deficient number, since it is larger than the sum of its proper divisors (57391949302501).

261675155555611 is a wasteful number, since it uses less digits than its factorization.

261675155555611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207587819.

The product of its digits is 47250000, while the sum is 61.

The spelling of 261675155555611 in words is "two hundred sixty-one trillion, six hundred seventy-five billion, one hundred fifty-five million, five hundred fifty-five thousand, six hundred eleven".