261535302646 has 16 divisors (see below), whose sum is σ = 406181357568. Its totient is φ = 126167005800.

The previous prime is 261535302643. The next prime is 261535302647. The reversal of 261535302646 is 646203535162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261535302643) 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, 6351550 + ... + 6392593.

It is an arithmetic number, because the mean of its divisors is an integer number (25386334848).

Almost surely, 2^261535302646 is an apocalyptic number.

261535302646 is a deficient number, since it is larger than the sum of its proper divisors (144646054922).

261535302646 is a wasteful number, since it uses less digits than its factorization.

261535302646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12744507.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 261535302646 in words is "two hundred sixty-one billion, five hundred thirty-five million, three hundred two thousand, six hundred forty-six".