261676126533171 has 16 divisors (see below), whose sum is σ = 398744941148928. Its totient is φ = 149529077392800.

The previous prime is 261676126533127. The next prime is 261676126533179. The reversal of 261676126533171 is 171335621676162.

It is not a de Polignac number, because 261676126533171 - 2¹¹ = 261676126531123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261676126533179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20353336 + ... + 30620426.

It is an arithmetic number, because the mean of its divisors is an integer number (24921558821808).

Almost surely, 2^{261676126533171} is an apocalyptic number.

261676126533171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

261676126533171 is a deficient number, since it is larger than the sum of its proper divisors (137068814615757).

261676126533171 is a wasteful number, since it uses less digits than its factorization.

261676126533171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11480762.

The product of its digits is 11430720, while the sum is 57.

The spelling of 261676126533171 in words is "two hundred sixty-one trillion, six hundred seventy-six billion, one hundred twenty-six million, five hundred thirty-three thousand, one hundred seventy-one".