661260000 has 240 divisors, whose sum is σ = 2210592384. Its totient is φ = 172992000.

The previous prime is 661259987. The next prime is 661260011. The reversal of 661260000 is 62166.

661260000 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6179947 + ... + 6180053.

Almost surely, 2^661260000 is an apocalyptic number.

661260000 is a gapful number since it is divisible by the number (60) 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 661260000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105296192).

661260000 is an abundant number, since it is smaller than the sum of its proper divisors (1549332384).

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

661260000 is a wasteful number, since it uses less digits than its factorization.

661260000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 661260000 is about 25714.9761812062. The cubic root of 661260000 is about 871.2124724904.

The spelling of 661260000 in words is "six hundred sixty-one million, two hundred sixty thousand".