661446150 has 48 divisors (see below), whose sum is σ = 1648704000. Its totient is φ = 175491360.

The previous prime is 661446143. The next prime is 661446169. The reversal of 661446150 is 51644166.

It is a happy number.

It is a super-2 number, since 2×661446150² = 875022018699645000, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18771 + ... + 40929.

It is an arithmetic number, because the mean of its divisors is an integer number (34348000).

Almost surely, 2^661446150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661446150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (824352000).

661446150 is an abundant number, since it is smaller than the sum of its proper divisors (987257850).

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

661446150 is a wasteful number, since it uses less digits than its factorization.

661446150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22373 (or 22368 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 661446150 is about 25718.5954126581. The cubic root of 661446150 is about 871.2942159227.

The spelling of 661446150 in words is "six hundred sixty-one million, four hundred forty-six thousand, one hundred fifty".