261061767 has 24 divisors (see below), whose sum is σ = 397804160. Its totient is φ = 164520720.

The previous prime is 261061747. The next prime is 261061769. The reversal of 261061767 is 767160162.

261061767 is a `hidden beast` number, since 26 + 10 + 617 + 6 + 7 = 666.

It is not a de Polignac number, because 261061767 - 2¹⁴ = 261045383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261061769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92142 + ... + 94932.

Almost surely, 2^261061767 is an apocalyptic number.

261061767 is a deficient number, since it is larger than the sum of its proper divisors (136742393).

261061767 is a wasteful number, since it uses less digits than its factorization.

261061767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363 (or 3360 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 261061767 is about 16157.4059489758. The cubic root of 261061767 is about 639.1180617522.

The spelling of 261061767 in words is "two hundred sixty-one million, sixty-one thousand, seven hundred sixty-seven".