261220797939 has 8 divisors (see below), whose sum is σ = 348300473040. Its totient is φ = 174144160736.

The previous prime is 261220797923. The next prime is 261220798001. The reversal of 261220797939 is 939797022162.

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 261220797939 - 2⁴ = 261220797923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261220798939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550632 + ... + 908645.

It is an arithmetic number, because the mean of its divisors is an integer number (43537559130).

Almost surely, 2^261220797939 is an apocalyptic number.

261220797939 is a deficient number, since it is larger than the sum of its proper divisors (87079675101).

261220797939 is a wasteful number, since it uses less digits than its factorization.

261220797939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518949.

The product of its (nonzero) digits is 5143824, while the sum is 57.

The spelling of 261220797939 in words is "two hundred sixty-one billion, two hundred twenty million, seven hundred ninety-seven thousand, nine hundred thirty-nine".