261669476 has 12 divisors (see below), whose sum is σ = 470298108. Its totient is φ = 127298592.

The previous prime is 261669437. The next prime is 261669497. The reversal of 261669476 is 674966162.

It can be written as a sum of positive squares in 2 ways, for example, as 107661376 + 154008100 = 10376^2 + 12410^2 .

It is a super-2 number, since 2×261669476² = 136941829340229152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261669476.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 883871 + ... + 884166.

It is an arithmetic number, because the mean of its divisors is an integer number (39191509).

Almost surely, 2^261669476 is an apocalyptic number.

It is an amenable number.

261669476 is a deficient number, since it is larger than the sum of its proper divisors (208628632).

261669476 is a wasteful number, since it uses less digits than its factorization.

261669476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768078 (or 1768076 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 261669476 is about 16176.2009136880. The cubic root of 261669476 is about 639.6135981359.

The spelling of 261669476 in words is "two hundred sixty-one million, six hundred sixty-nine thousand, four hundred seventy-six".