261266178323 has 8 divisors (see below), whose sum is σ = 264825236928. Its totient is φ = 257716912104.

The previous prime is 261266178317. The next prime is 261266178353. The reversal of 261266178323 is 323871662162.

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 261266178323 - 2⁴ = 261266178307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261266178353) 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, 2394365 + ... + 2501102.

It is an arithmetic number, because the mean of its divisors is an integer number (33103154616).

Almost surely, 2^261266178323 is an apocalyptic number.

261266178323 is a deficient number, since it is larger than the sum of its proper divisors (3559058605).

261266178323 is an equidigital number, since it uses as much as digits as its factorization.

261266178323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896193.

The product of its digits is 870912, while the sum is 47.

The spelling of 261266178323 in words is "two hundred sixty-one billion, two hundred sixty-six million, one hundred seventy-eight thousand, three hundred twenty-three".