261555266068 has 24 divisors (see below), whose sum is σ = 461656832000. Its totient is φ = 129654792288.

The previous prime is 261555266039. The next prime is 261555266069. The reversal of 261555266068 is 860662555162.

It is a super-2 number, since 2×261555266068² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261555266069) 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, 526678 + ... + 894706.

Almost surely, 2^261555266068 is an apocalyptic number.

It is an amenable number.

261555266068 is a deficient number, since it is larger than the sum of its proper divisors (200101565932).

261555266068 is a wasteful number, since it uses less digits than its factorization.

261555266068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369559 (or 369557 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 261555266068 in words is "two hundred sixty-one billion, five hundred fifty-five million, two hundred sixty-six thousand, sixty-eight".