261440637662452 has 24 divisors (see below), whose sum is σ = 461065643771040. Its totient is φ = 129707821694880.

The previous prime is 261440637662327. The next prime is 261440637662459. The reversal of 261440637662452 is 254266736044162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261440637662459) 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, 23487927 + ... + 32780542.

It is an arithmetic number, because the mean of its divisors is an integer number (19211068490460).

Almost surely, 2^{261440637662452} is an apocalyptic number.

It is an amenable number.

261440637662452 is a deficient number, since it is larger than the sum of its proper divisors (199625006108588).

261440637662452 is a wasteful number, since it uses less digits than its factorization.

261440637662452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56277471 (or 56277469 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 58.

The spelling of 261440637662452 in words is "two hundred sixty-one trillion, four hundred forty billion, six hundred thirty-seven million, six hundred sixty-two thousand, four hundred fifty-two".