261533466006646 has 16 divisors (see below), whose sum is σ = 392994609712848. Its totient is φ = 130535271360000.

The previous prime is 261533466006599. The next prime is 261533466006649. The reversal of 261533466006646 is 646600664335162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261533466006649) 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, 59548686 + ... + 63789598.

It is an arithmetic number, because the mean of its divisors is an integer number (24562163107053).

Almost surely, 2^{261533466006646} is an apocalyptic number.

261533466006646 is a deficient number, since it is larger than the sum of its proper divisors (131461143706202).

261533466006646 is a wasteful number, since it uses less digits than its factorization.

261533466006646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295487.

The product of its (nonzero) digits is 67184640, while the sum is 58.

The spelling of 261533466006646 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, four hundred sixty-six million, six thousand, six hundred forty-six".