261646061312216 has 96 divisors (see below), whose sum is σ = 585369363902400. Its totient is φ = 109268944404480.

The previous prime is 261646061312143. The next prime is 261646061312227. The reversal of 261646061312216 is 612213160646162.

It is a super-2 number, since 2×261646061312216² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26788265 + ... + 35226456.

It is an arithmetic number, because the mean of its divisors is an integer number (6097597540650).

Almost surely, 2^{261646061312216} is an apocalyptic number.

It is an amenable number.

261646061312216 is an abundant number, since it is smaller than the sum of its proper divisors (323723302590184).

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

261646061312216 is a wasteful number, since it uses less digits than its factorization.

261646061312216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62015017 (or 62015006 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 261646061312216 in words is "two hundred sixty-one trillion, six hundred forty-six billion, sixty-one million, three hundred twelve thousand, two hundred sixteen".