261657383 has 8 divisors (see below), whose sum is σ = 282281328. Its totient is φ = 241104384.

The previous prime is 261657359. The next prime is 261657433. The reversal of 261657383 is 383756162.

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

It is a cyclic number.

It is not a de Polignac number, because 261657383 - 2⁸ = 261657127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261657383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261657313) 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, 9941 + ... + 24942.

It is an arithmetic number, because the mean of its divisors is an integer number (35285166).

Almost surely, 2^261657383 is an apocalyptic number.

261657383 is a deficient number, since it is larger than the sum of its proper divisors (20623945).

261657383 is a wasteful number, since it uses less digits than its factorization.

261657383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35473.

The product of its digits is 181440, while the sum is 41.

The square root of 261657383 is about 16175.8271195015. The cubic root of 261657383 is about 639.6037447813.

The spelling of 261657383 in words is "two hundred sixty-one million, six hundred fifty-seven thousand, three hundred eighty-three".