261646204430554 has 16 divisors (see below), whose sum is σ = 413172367764480. Its totient is φ = 123923641236480.

The previous prime is 261646204430543. The next prime is 261646204430563. The reversal of 261646204430554 is 455034402646162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389508519 + ... + 390179674.

It is an arithmetic number, because the mean of its divisors is an integer number (25823272985280).

Almost surely, 2^{261646204430554} is an apocalyptic number.

261646204430554 is a deficient number, since it is larger than the sum of its proper divisors (151526163333926).

261646204430554 is a wasteful number, since it uses less digits than its factorization.

261646204430554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779697045.

The product of its (nonzero) digits is 16588800, while the sum is 52.

The spelling of 261646204430554 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred four million, four hundred thirty thousand, five hundred fifty-four".