261657032240773 has 16 divisors (see below), whose sum is σ = 282531704495040. Its totient is φ = 240889934202624.

The previous prime is 261657032240767. The next prime is 261657032240789. The reversal of 261657032240773 is 377042230756162.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261657032240773 is a prime.

It is a super-3 number, since 3×261657032240773³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261657032240743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9730036 + ... + 24859357.

It is an arithmetic number, because the mean of its divisors is an integer number (17658231530940).

Almost surely, 2^{261657032240773} is an apocalyptic number.

It is an amenable number.

261657032240773 is a deficient number, since it is larger than the sum of its proper divisors (20874672254267).

261657032240773 is a wasteful number, since it uses less digits than its factorization.

261657032240773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34590948.

The product of its (nonzero) digits is 17781120, while the sum is 55.

The spelling of 261657032240773 in words is "two hundred sixty-one trillion, six hundred fifty-seven billion, thirty-two million, two hundred forty thousand, seven hundred seventy-three".