261706772420271 has 16 divisors (see below), whose sum is σ = 400220631659520. Its totient is φ = 168843078980280.

The previous prime is 261706772420231. The next prime is 261706772420389. The reversal of 261706772420271 is 172024277607162.

It is a happy number.

261706772420271 is a `hidden beast` number, since 2 + 6 + 1 + 70 + 67 + 7 + 242 + 0 + 271 = 666.

It is not a de Polignac number, because 261706772420271 - 2⁹ = 261706772419759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261706772420221) 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, 156336183405 + ... + 156336185078.

It is an arithmetic number, because the mean of its divisors is an integer number (25013789478720).

Almost surely, 2^{261706772420271} is an apocalyptic number.

261706772420271 is a deficient number, since it is larger than the sum of its proper divisors (138513859239249).

261706772420271 is a wasteful number, since it uses less digits than its factorization.

261706772420271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312672368523 (or 312672368517 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 54.

The spelling of 261706772420271 in words is "two hundred sixty-one trillion, seven hundred six billion, seven hundred seventy-two million, four hundred twenty thousand, two hundred seventy-one".