261567605228 has 12 divisors (see below), whose sum is σ = 457749704832. Its totient is φ = 130781975280.

The previous prime is 261567605227. The next prime is 261567605279. The reversal of 261567605228 is 822506765162.

It is a super-2 number, since 2×261567605228² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261567605227) 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, 104588 + ... + 730803.

It is an arithmetic number, because the mean of its divisors is an integer number (38145808736).

Almost surely, 2^261567605228 is an apocalyptic number.

It is an amenable number.

261567605228 is a deficient number, since it is larger than the sum of its proper divisors (196182099604).

261567605228 is a wasteful number, since it uses less digits than its factorization.

261567605228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913672 (or 913670 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 261567605228 in words is "two hundred sixty-one billion, five hundred sixty-seven million, six hundred five thousand, two hundred twenty-eight".