261646656064276 has 96 divisors (see below), whose sum is σ = 557788776007680. Its totient is φ = 104976257637504.

The previous prime is 261646656064271. The next prime is 261646656064301. The reversal of 261646656064276 is 672460656646162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646656064271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17154391 + ... + 28593118.

It is an arithmetic number, because the mean of its divisors is an integer number (5810299750080).

Almost surely, 2^{261646656064276} is an apocalyptic number.

It is an amenable number.

261646656064276 is an abundant number, since it is smaller than the sum of its proper divisors (296142119943404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261646656064276 is a wasteful number, since it uses less digits than its factorization.

261646656064276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45747733 (or 45747731 counting only the distinct ones).

The product of its (nonzero) digits is 627056640, while the sum is 67.

The spelling of 261646656064276 in words is "two hundred sixty-one trillion, six hundred forty-six billion, six hundred fifty-six million, sixty-four thousand, two hundred seventy-six".