261646205262531 has 8 divisors (see below), whose sum is σ = 348861794448720. Its totient is φ = 174430709792352.

The previous prime is 261646205262517. The next prime is 261646205262601. The reversal of 261646205262531 is 135262502646162.

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

It is not a de Polignac number, because 261646205262531 - 2²⁹ = 261645668391619 is a prime.

It is a super-2 number, since 2×261646205262531² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261646205262031) 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, 16632936 + ... + 28283333.

It is an arithmetic number, because the mean of its divisors is an integer number (43607724306090).

Almost surely, 2^{261646205262531} is an apocalyptic number.

261646205262531 is a deficient number, since it is larger than the sum of its proper divisors (87215589186189).

261646205262531 is a wasteful number, since it uses less digits than its factorization.

261646205262531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46858005.

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 261646205262531 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred five million, two hundred sixty-two thousand, five hundred thirty-one".