261646077761632 has 24 divisors (see below), whose sum is σ = 517961658784752. Its totient is φ = 130100259657600.

The previous prime is 261646077761617. The next prime is 261646077761633. The reversal of 261646077761632 is 236167770646162.

It is a happy number.

It is a super-2 number, since 2×261646077761632² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646077761633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22586844844 + ... + 22586856427.

It is an arithmetic number, because the mean of its divisors is an integer number (21581735782698).

Almost surely, 2^{261646077761632} is an apocalyptic number.

It is an amenable number.

261646077761632 is a deficient number, since it is larger than the sum of its proper divisors (256315581023120).

261646077761632 is a wasteful number, since it uses less digits than its factorization.

261646077761632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45173701462 (or 45173701454 counting only the distinct ones).

The product of its (nonzero) digits is 128024064, while the sum is 64.

The spelling of 261646077761632 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seventy-seven million, seven hundred sixty-one thousand, six hundred thirty-two".