665377619904 has 224 divisors, whose sum is σ = 1972782318080. Its totient is φ = 219905280000.

The previous prime is 665377619899. The next prime is 665377619953. The reversal of 665377619904 is 409916773566.

665377619904 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 7 + 7 + 619 + 9 + 0 + 4 = 666.

It is a super-2 number, since 2×665377619904² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156815607 + ... + 156819849.

It is an arithmetic number, because the mean of its divisors is an integer number (8807063920).

Almost surely, 2^665377619904 is an apocalyptic number.

665377619904 is a gapful number since it is divisible by the number (64) 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 665377619904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986391159040).

665377619904 is an abundant number, since it is smaller than the sum of its proper divisors (1307404698176).

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

665377619904 is a wasteful number, since it uses less digits than its factorization.

665377619904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016 (or 5000 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 63.

The spelling of 665377619904 in words is "six hundred sixty-five billion, three hundred seventy-seven million, six hundred nineteen thousand, nine hundred four".