261631230443 has 32 divisors (see below), whose sum is σ = 320251216320. Its totient is φ = 210864640000.

The previous prime is 261631230437. The next prime is 261631230467. The reversal of 261631230443 is 344032136162.

It is not a de Polignac number, because 261631230443 - 2¹² = 261631226347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261631230473) 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, 366008 + ... + 810693.

It is an arithmetic number, because the mean of its divisors is an integer number (10007850510).

Almost surely, 2^261631230443 is an apocalyptic number.

261631230443 is a deficient number, since it is larger than the sum of its proper divisors (58619985877).

261631230443 is a wasteful number, since it uses less digits than its factorization.

261631230443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176799.

The product of its (nonzero) digits is 62208, while the sum is 35.

The spelling of 261631230443 in words is "two hundred sixty-one billion, six hundred thirty-one million, two hundred thirty thousand, four hundred forty-three".