66409797116928 has 352 divisors, whose sum is σ = 187426322703360. Its totient is φ = 20875086561280.

The previous prime is 66409797116917. The next prime is 66409797116959. The reversal of 66409797116928 is 82961179790466.

It is a super-2 number, since 2×66409797116928² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66409797116928.

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, 676752475 + ... + 676850597.

Almost surely, 2^{66409797116928} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66409797116928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93713161351680).

66409797116928 is an abundant number, since it is smaller than the sum of its proper divisors (121016525586432).

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

66409797116928 is a wasteful number, since it uses less digits than its factorization.

66409797116928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98353 (or 98335 counting only the distinct ones).

The product of its (nonzero) digits is 493807104, while the sum is 75.

The spelling of 66409797116928 in words is "sixty-six trillion, four hundred nine billion, seven hundred ninety-seven million, one hundred sixteen thousand, nine hundred twenty-eight".