665058638880 has 480 divisors, whose sum is σ = 2463968263680. Its totient is φ = 168713072640.

The previous prime is 665058638843. The next prime is 665058638891. The reversal of 665058638880 is 88836850566.

665058638880 is a `hidden beast` number, since 66 + 505 + 8 + 63 + 8 + 8 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 23689812 + ... + 23717868.

It is an arithmetic number, because the mean of its divisors is an integer number (5133267216).

Almost surely, 2^665058638880 is an apocalyptic number.

665058638880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665058638880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231984131840).

665058638880 is an abundant number, since it is smaller than the sum of its proper divisors (1798909624800).

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

665058638880 is a wasteful number, since it uses less digits than its factorization.

665058638880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28174 (or 28157 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 665058638880 in words is "six hundred sixty-five billion, fifty-eight million, six hundred thirty-eight thousand, eight hundred eighty".