261123827961 has 8 divisors (see below), whose sum is σ = 348232690080. Its totient is φ = 174048758912.

The previous prime is 261123827927. The next prime is 261123827981. The reversal of 261123827961 is 169728321162.

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 261123827961 - 2³⁰ = 260050086137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261123827961.

It is not an unprimeable number, because it can be changed into a prime (261123827981) 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, 8430231 + ... + 8461148.

It is an arithmetic number, because the mean of its divisors is an integer number (43529086260).

Almost surely, 2^261123827961 is an apocalyptic number.

It is an amenable number.

261123827961 is a deficient number, since it is larger than the sum of its proper divisors (87108862119).

261123827961 is a wasteful number, since it uses less digits than its factorization.

261123827961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16896535.

The product of its digits is 435456, while the sum is 48.

The spelling of 261123827961 in words is "two hundred sixty-one billion, one hundred twenty-three million, eight hundred twenty-seven thousand, nine hundred sixty-one".