661260210 has 64 divisors (see below), whose sum is σ = 1728397440. Its totient is φ = 160934400.

The previous prime is 661260199. The next prime is 661260221. The reversal of 661260210 is 12062166.

661260210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661260199) and next prime (661260221).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25185 + ... + 44235.

It is an arithmetic number, because the mean of its divisors is an integer number (27006210).

Almost surely, 2^661260210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661260210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864198720).

661260210 is an abundant number, since it is smaller than the sum of its proper divisors (1067137230).

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

661260210 is a wasteful number, since it uses less digits than its factorization.

661260210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19163.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 661260210 is about 25714.9802644295. The cubic root of 661260210 is about 871.2125647156.

The spelling of 661260210 in words is "six hundred sixty-one million, two hundred sixty thousand, two hundred ten".