261440046144634 has 64 divisors (see below), whose sum is σ = 475239380781312. Its totient is φ = 105300924825600.

The previous prime is 261440046144581. The next prime is 261440046144637. The reversal of 261440046144634 is 436441640044162.

It is a happy number.

261440046144634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261440046144637) 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, 864762522 + ... + 865064794.

It is an arithmetic number, because the mean of its divisors is an integer number (7425615324708).

Almost surely, 2^{261440046144634} is an apocalyptic number.

261440046144634 is a deficient number, since it is larger than the sum of its proper divisors (213799334636678).

261440046144634 is a wasteful number, since it uses less digits than its factorization.

261440046144634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307591.

The product of its (nonzero) digits is 5308416, while the sum is 49.

Adding to 261440046144634 its reverse (436441640044162), we get a palindrome (697881686188796).

The spelling of 261440046144634 in words is "two hundred sixty-one trillion, four hundred forty billion, forty-six million, one hundred forty-four thousand, six hundred thirty-four".