261449399839 has 8 divisors (see below), whose sum is σ = 263941378272. Its totient is φ = 258960549120.

The previous prime is 261449399791. The next prime is 261449399881. The reversal of 261449399839 is 938993944162.

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 261449399839 - 2⁷ = 261449399711 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 (261449399639) 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, 613779 + ... + 948484.

It is an arithmetic number, because the mean of its divisors is an integer number (32992672284).

Almost surely, 2^261449399839 is an apocalyptic number.

261449399839 is a deficient number, since it is larger than the sum of its proper divisors (2491978433).

261449399839 is a wasteful number, since it uses less digits than its factorization.

261449399839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563857.

The product of its digits is 90699264, while the sum is 67.

The spelling of 261449399839 in words is "two hundred sixty-one billion, four hundred forty-nine million, three hundred ninety-nine thousand, eight hundred thirty-nine".