261273600000 has 1260 divisors, whose sum is σ = 1119126215088. Its totient is φ = 59719680000.

The previous prime is 261273599999. The next prime is 261273600011. The reversal of 261273600000 is 6372162.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1260).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 37324799997 + ... + 37324800003.

Almost surely, 2^261273600000 is an apocalyptic number.

261273600000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261273600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559563107544).

261273600000 is an abundant number, since it is smaller than the sum of its proper divisors (857852615088).

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

261273600000 is an frugal number, since it uses more digits than its factorization.

261273600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

Adding to 261273600000 its reverse (6372162), we get a palindrome (261279972162).

The spelling of 261273600000 in words is "two hundred sixty-one billion, two hundred seventy-three million, six hundred thousand".