661005084 has 48 divisors (see below), whose sum is σ = 1660780800. Its totient is φ = 203855616.

The previous prime is 661005083. The next prime is 661005097. The reversal of 661005084 is 480500166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661005083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15424 + ... + 39495.

It is an arithmetic number, because the mean of its divisors is an integer number (34599600).

Almost surely, 2^661005084 is an apocalyptic number.

It is an amenable number.

661005084 is an abundant number, since it is smaller than the sum of its proper divisors (999775716).

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

661005084 is a wasteful number, since it uses less digits than its factorization.

661005084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55002 (or 55000 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 661005084 is about 25710.0191365156. The cubic root of 661005084 is about 871.1005071803.

The spelling of 661005084 in words is "six hundred sixty-one million, five thousand, eighty-four".