665463003840 has 672 divisors, whose sum is σ = 2487844509696. Its totient is φ = 168991764480.

The previous prime is 665463003791. The next prime is 665463003851. The reversal of 665463003840 is 48300364566.

665463003840 is a `hidden beast` number, since 6 + 6 + 5 + 4 + 630 + 0 + 3 + 8 + 4 + 0 = 666.

665463003840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 484677394 + ... + 484678766.

It is an arithmetic number, because the mean of its divisors is an integer number (3702149568).

Almost surely, 2^665463003840 is an apocalyptic number.

665463003840 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 665463003840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1243922254848).

665463003840 is an abundant number, since it is smaller than the sum of its proper divisors (1822381505856).

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

665463003840 is a wasteful number, since it uses less digits than its factorization.

665463003840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 665463003840 in words is "six hundred sixty-five billion, four hundred sixty-three million, three thousand, eight hundred forty".