261550500 has 48 divisors (see below), whose sum is σ = 761639424. Its totient is φ = 69746400.

The previous prime is 261550489. The next prime is 261550517. The reversal of 261550500 is 5055162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85684 + ... + 88683.

It is an arithmetic number, because the mean of its divisors is an integer number (15867488).

Almost surely, 2^261550500 is an apocalyptic number.

261550500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261550500 is an abundant number, since it is smaller than the sum of its proper divisors (500088924).

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

261550500 is a wasteful number, since it uses less digits than its factorization.

261550500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174389 (or 174377 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 261550500 is about 16172.5229942641. The cubic root of 261550500 is about 639.5166435031.

The spelling of 261550500 in words is "two hundred sixty-one million, five hundred fifty thousand, five hundred".