261726675066 has 128 divisors (see below), whose sum is σ = 600345757440. Its totient is φ = 84471496704.

The previous prime is 261726675061. The next prime is 261726675137. The reversal of 261726675066 is 660576627162.

261726675066 is a `hidden beast` number, since 2 + 6 + 1 + 72 + 6 + 67 + 506 + 6 = 666.

It is a super-2 number, since 2×261726675066² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (261726675061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 151024336 + ... + 151026068.

It is an arithmetic number, because the mean of its divisors is an integer number (4690201230).

Almost surely, 2^261726675066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261726675066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300172878720).

261726675066 is an abundant number, since it is smaller than the sum of its proper divisors (338619082374).

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

261726675066 is a wasteful number, since it uses less digits than its factorization.

261726675066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317 (or 2311 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 261726675066 in words is "two hundred sixty-one billion, seven hundred twenty-six million, six hundred seventy-five thousand, sixty-six".