664550012473650 has 240 divisors, whose sum is σ = 1874644615958400. Its totient is φ = 174520302503040.

The previous prime is 664550012473603. The next prime is 664550012473679. The reversal of 664550012473650 is 56374210055466.

664550012473650 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 500 + 1 + 2 + 4 + 73 + 65 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 121790829 + ... + 127130271.

It is an arithmetic number, because the mean of its divisors is an integer number (7811019233160).

Almost surely, 2^{664550012473650} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664550012473650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937322307979200).

664550012473650 is an abundant number, since it is smaller than the sum of its proper divisors (1210094603484750).

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

664550012473650 is a wasteful number, since it uses less digits than its factorization.

664550012473650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5339935 (or 5339921 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 54.

The spelling of 664550012473650 in words is "six hundred sixty-four trillion, five hundred fifty billion, twelve million, four hundred seventy-three thousand, six hundred fifty".