261635366056 has 16 divisors (see below), whose sum is σ = 516385591200. Its totient is φ = 123932541744.

The previous prime is 261635366053. The next prime is 261635366087. The reversal of 261635366056 is 650663536162.

It is not an unprimeable number, because it can be changed into a prime (261635366053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860642500 + ... + 860642803.

It is an arithmetic number, because the mean of its divisors is an integer number (32274099450).

Almost surely, 2^261635366056 is an apocalyptic number.

It is an amenable number.

261635366056 is a deficient number, since it is larger than the sum of its proper divisors (254750225144).

261635366056 is a wasteful number, since it uses less digits than its factorization.

261635366056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721285328 (or 1721285324 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 49.

The spelling of 261635366056 in words is "two hundred sixty-one billion, six hundred thirty-five million, three hundred sixty-six thousand, fifty-six".