261366764271 has 8 divisors (see below), whose sum is σ = 349784518320. Its totient is φ = 173596759872.

The previous prime is 261366764251. The next prime is 261366764273. The reversal of 261366764271 is 172467663162.

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

It is not a de Polignac number, because 261366764271 - 2⁷ = 261366764143 is a prime.

It is a super-2 number, since 2×261366764271² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261366764273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161936470 + ... + 161938083.

It is an arithmetic number, because the mean of its divisors is an integer number (43723064790).

Almost surely, 2^261366764271 is an apocalyptic number.

261366764271 is a deficient number, since it is larger than the sum of its proper divisors (88417754049).

261366764271 is a wasteful number, since it uses less digits than its factorization.

261366764271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323874825.

The product of its digits is 3048192, while the sum is 51.

The spelling of 261366764271 in words is "two hundred sixty-one billion, three hundred sixty-six million, seven hundred sixty-four thousand, two hundred seventy-one".