661310080 has 32 divisors (see below), whose sum is σ = 1580945940. Its totient is φ = 264523776.

The previous prime is 661310063. The next prime is 661310101. The reversal of 661310080 is 80013166.

It can be written as a sum of positive squares in 2 ways, for example, as 643535424 + 17774656 = 25368^2 + 4216^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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 3 ways as a sum of consecutive naturals, for example, 516009 + ... + 517288.

Almost surely, 2^661310080 is an apocalyptic number.

It is an amenable number.

661310080 is an abundant number, since it is smaller than the sum of its proper divisors (919635860).

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

661310080 is a wasteful number, since it uses less digits than its factorization.

661310080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033316 (or 1033304 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 661310080 is about 25715.9499144014. The cubic root of 661310080 is about 871.2344654630.

The spelling of 661310080 in words is "six hundred sixty-one million, three hundred ten thousand, eighty".