261669475 has 6 divisors (see below), whose sum is σ = 324470180. Its totient is φ = 209335560.

The previous prime is 261669437. The next prime is 261669497. The reversal of 261669475 is 574966162.

261669475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261669475 - 2¹⁹ = 261145187 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5233365 + ... + 5233414.

Almost surely, 2^261669475 is an apocalyptic number.

261669475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261669475 is a deficient number, since it is larger than the sum of its proper divisors (62800705).

261669475 is a wasteful number, since it uses less digits than its factorization.

261669475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10466789 (or 10466784 counting only the distinct ones).

The product of its digits is 544320, while the sum is 46.

The square root of 261669475 is about 16176.2008827784. The cubic root of 261669475 is about 639.6135973211.

It can be divided in two parts, 261669 and 475, that added together give a 18-th power (262144 = 2¹⁸).

The spelling of 261669475 in words is "two hundred sixty-one million, six hundred sixty-nine thousand, four hundred seventy-five".