261925660 has 24 divisors (see below), whose sum is σ = 552041280. Its totient is φ = 104389824.

The previous prime is 261925649. The next prime is 261925661. The reversal of 261925660 is 66529162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261925661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18100 + ... + 29179.

It is an arithmetic number, because the mean of its divisors is an integer number (23001720).

Almost surely, 2^261925660 is an apocalyptic number.

261925660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261925660 is an abundant number, since it is smaller than the sum of its proper divisors (290115620).

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

261925660 is a wasteful number, since it uses less digits than its factorization.

261925660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47565 (or 47563 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 261925660 is about 16184.1175230533. The cubic root of 261925660 is about 639.8222650988.

The spelling of 261925660 in words is "two hundred sixty-one million, nine hundred twenty-five thousand, six hundred sixty".