661620582 has 32 divisors (see below), whose sum is σ = 1680307200. Its totient is φ = 189034344.

The previous prime is 661620581. The next prime is 661620601. The reversal of 661620582 is 285026166.

661620582 is a `hidden beast` number, since 66 + 16 + 2 + 0 + 582 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661620581) 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, 874782 + ... + 875537.

It is an arithmetic number, because the mean of its divisors is an integer number (52509600).

Almost surely, 2^661620582 is an apocalyptic number.

661620582 is an abundant number, since it is smaller than the sum of its proper divisors (1018686618).

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

661620582 is a wasteful number, since it uses less digits than its factorization.

661620582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750337 (or 1750331 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 661620582 is about 25721.9863540902. The cubic root of 661620582 is about 871.3707997508.

The spelling of 661620582 in words is "six hundred sixty-one million, six hundred twenty thousand, five hundred eighty-two".