261016435700 has 72 divisors (see below), whose sum is σ = 567954403800. Its totient is φ = 104121538560.

The previous prime is 261016435661. The next prime is 261016435747. The reversal of 261016435700 is 7534610162.

It can be written as a sum of positive squares in 12 ways, for example, as 229682479504 + 31333956196 = 479252^2 + 177014^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66431336 + ... + 66435264.

Almost surely, 2^261016435700 is an apocalyptic number.

261016435700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261016435700 is an abundant number, since it is smaller than the sum of its proper divisors (306937968100).

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

261016435700 is a wasteful number, since it uses less digits than its factorization.

261016435700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589 (or 5582 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 261016435700 in words is "two hundred sixty-one billion, sixteen million, four hundred thirty-five thousand, seven hundred".