66736494720 has 768 divisors, whose sum is σ = 284697504000. Its totient is φ = 14349533184.

The previous prime is 66736494709. The next prime is 66736494749. The reversal of 66736494720 is 2749463766.

66736494720 is a `hidden beast` number, since 66 + 73 + 6 + 49 + 472 + 0 = 666.

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, 33585567 + ... + 33587553.

It is an arithmetic number, because the mean of its divisors is an integer number (370699875).

Almost surely, 2^66736494720 is an apocalyptic number.

66736494720 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 66736494720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142348752000).

66736494720 is an abundant number, since it is smaller than the sum of its proper divisors (217961009280).

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

66736494720 is a wasteful number, since it uses less digits than its factorization.

66736494720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050 (or 2021 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The spelling of 66736494720 in words is "sixty-six billion, seven hundred thirty-six million, four hundred ninety-four thousand, seven hundred twenty".