261879049901 has 8 divisors (see below), whose sum is σ = 301646960640. Its totient is φ = 222700293648.

The previous prime is 261879049879. The next prime is 261879049903. The reversal of 261879049901 is 109940978162.

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

It is not a de Polignac number, because 261879049901 - 2³⁰ = 260805308077 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 (261879049903) 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, 147287666 + ... + 147289443.

It is an arithmetic number, because the mean of its divisors is an integer number (37705870080).

Almost surely, 2^261879049901 is an apocalyptic number.

It is an amenable number.

261879049901 is a deficient number, since it is larger than the sum of its proper divisors (39767910739).

261879049901 is a wasteful number, since it uses less digits than its factorization.

261879049901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294577243.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 261879049901 in words is "two hundred sixty-one billion, eight hundred seventy-nine million, forty-nine thousand, nine hundred one".