261379388285 has 8 divisors (see below), whose sum is σ = 318072946176. Its totient is φ = 206158390480.

The previous prime is 261379388219. The next prime is 261379388299. The reversal of 261379388285 is 582883973162.

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

It is not a de Polignac number, because 261379388285 - 2³⁴ = 244199519101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368139629 + ... + 368140338.

It is an arithmetic number, because the mean of its divisors is an integer number (39759118272).

Almost surely, 2^261379388285 is an apocalyptic number.

It is an amenable number.

261379388285 is a deficient number, since it is larger than the sum of its proper divisors (56693557891).

261379388285 is an equidigital number, since it uses as much as digits as its factorization.

261379388285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736280043.

The product of its digits is 34836480, while the sum is 62.

The spelling of 261379388285 in words is "two hundred sixty-one billion, three hundred seventy-nine million, three hundred eighty-eight thousand, two hundred eighty-five".