261485548080 has 160 divisors (see below), whose sum is σ = 838146736128. Its totient is φ = 67367808000.

The previous prime is 261485548063. The next prime is 261485548081. The reversal of 261485548080 is 80845584162.

It is not an unprimeable number, because it can be changed into a prime (261485548081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4487130 + ... + 4545030.

Almost surely, 2^261485548080 is an apocalyptic number.

261485548080 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 261485548080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419073368064).

261485548080 is an abundant number, since it is smaller than the sum of its proper divisors (576661188048).

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

261485548080 is a wasteful number, since it uses less digits than its factorization.

261485548080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58555 (or 58549 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 51.

The spelling of 261485548080 in words is "two hundred sixty-one billion, four hundred eighty-five million, five hundred forty-eight thousand, eighty".