661434450 has 48 divisors (see below), whose sum is σ = 1646382720. Its totient is φ = 175734720.

The previous prime is 661434443. The next prime is 661434451. The reversal of 661434450 is 54434166.

It is not an unprimeable number, because it can be changed into a prime (661434451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33591 + ... + 49509.

It is an arithmetic number, because the mean of its divisors is an integer number (34299640).

Almost surely, 2^661434450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661434450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823191360).

661434450 is an abundant number, since it is smaller than the sum of its proper divisors (984948270).

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

661434450 is a wasteful number, since it uses less digits than its factorization.

661434450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16211 (or 16206 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 661434450 is about 25718.3679497747. The cubic root of 661434450 is about 871.2890785922.

The spelling of 661434450 in words is "six hundred sixty-one million, four hundred thirty-four thousand, four hundred fifty".