261825666949 has 16 divisors (see below), whose sum is σ = 335254490496. Its totient is φ = 198505944000.

The previous prime is 261825666901. The next prime is 261825666961. The reversal of 261825666949 is 949666528162.

It is not a de Polignac number, because 261825666949 - 2²⁹ = 261288796037 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 (261825666049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45947602 + ... + 45953299.

It is an arithmetic number, because the mean of its divisors is an integer number (20953405656).

Almost surely, 2^261825666949 is an apocalyptic number.

It is an amenable number.

261825666949 is a deficient number, since it is larger than the sum of its proper divisors (73428823547).

261825666949 is a wasteful number, since it uses less digits than its factorization.

261825666949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91900956.

The product of its digits is 67184640, while the sum is 64.

The spelling of 261825666949 in words is "two hundred sixty-one billion, eight hundred twenty-five million, six hundred sixty-six thousand, nine hundred forty-nine".