261612166212 has 36 divisors (see below), whose sum is σ = 667477779696. Its totient is φ = 86389062960.

The previous prime is 261612166117. The next prime is 261612166273. The reversal of 261612166212 is 212661216162.

261612166212 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 1 + 21 + 6 + 621 + 2 = 666.

261612166212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×261612166212² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33954114 + ... + 33961817.

It is an arithmetic number, because the mean of its divisors is an integer number (18541049436).

Almost surely, 2^261612166212 is an apocalyptic number.

It is an amenable number.

261612166212 is an abundant number, since it is smaller than the sum of its proper divisors (405865613484).

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

261612166212 is a wasteful number, since it uses less digits than its factorization.

261612166212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67916048 (or 67916043 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The spelling of 261612166212 in words is "two hundred sixty-one billion, six hundred twelve million, one hundred sixty-six thousand, two hundred twelve".