661745448 has 96 divisors (see below), whose sum is σ = 2205840000. Its totient is φ = 174524544.

The previous prime is 661745419. The next prime is 661745467. The reversal of 661745448 is 844547166.

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, 43948 + ... + 57051.

It is an arithmetic number, because the mean of its divisors is an integer number (22977500).

Almost surely, 2^661745448 is an apocalyptic number.

It is an amenable number.

661745448 is an abundant number, since it is smaller than the sum of its proper divisors (1544094552).

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

661745448 is a wasteful number, since it uses less digits than its factorization.

661745448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101031 (or 101024 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 661745448 is about 25724.4134627011. The cubic root of 661745448 is about 871.4256135142.

The spelling of 661745448 in words is "six hundred sixty-one million, seven hundred forty-five thousand, four hundred forty-eight".