261170564 has 6 divisors (see below), whose sum is σ = 457048494. Its totient is φ = 130585280.

The previous prime is 261170563. The next prime is 261170593. The reversal of 261170564 is 465071162.

It can be written as a sum of positive squares in only one way, i.e., 261145600 + 24964 = 16160^2 + 158^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261170564.

It is not an unprimeable number, because it can be changed into a prime (261170563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32646317 + ... + 32646324.

It is an arithmetic number, because the mean of its divisors is an integer number (76174749).

Almost surely, 2^261170564 is an apocalyptic number.

It is an amenable number.

261170564 is a deficient number, since it is larger than the sum of its proper divisors (195877930).

261170564 is a wasteful number, since it uses less digits than its factorization.

261170564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65292645 (or 65292643 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 261170564 is about 16160.7723825317. The cubic root of 261170564 is about 639.2068331713.

The spelling of 261170564 in words is "two hundred sixty-one million, one hundred seventy thousand, five hundred sixty-four".