261246665604 has 96 divisors (see below), whose sum is σ = 634335077376. Its totient is φ = 83609850240.

The previous prime is 261246665591. The next prime is 261246665621. The reversal of 261246665604 is 406566642162.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35632219 + ... + 35639549.

It is an arithmetic number, because the mean of its divisors is an integer number (6607657056).

Almost surely, 2^261246665604 is an apocalyptic number.

It is an amenable number.

261246665604 is an abundant number, since it is smaller than the sum of its proper divisors (373088411772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261246665604 is a wasteful number, since it uses less digits than its factorization.

261246665604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8425 (or 8423 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 261246665604 in words is "two hundred sixty-one billion, two hundred forty-six million, six hundred sixty-five thousand, six hundred four".