261669477 has 8 divisors (see below), whose sum is σ = 349054720. Its totient is φ = 174365280.

The previous prime is 261669437. The next prime is 261669497. The reversal of 261669477 is 774966162.

261669477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261669477 - 2¹⁶ = 261603941 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 (261669437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12277 + ... + 25962.

It is an arithmetic number, because the mean of its divisors is an integer number (43631840).

Almost surely, 2^261669477 is an apocalyptic number.

It is an amenable number.

261669477 is a deficient number, since it is larger than the sum of its proper divisors (87385243).

261669477 is a wasteful number, since it uses less digits than its factorization.

261669477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40523.

The product of its digits is 762048, while the sum is 48.

The square root of 261669477 is about 16176.2009445976. The cubic root of 261669477 is about 639.6135989507.

The spelling of 261669477 in words is "two hundred sixty-one million, six hundred sixty-nine thousand, four hundred seventy-seven".