66513329117450 has 48 divisors (see below), whose sum is σ = 124987868285280. Its totient is φ = 26332945128000.

The previous prime is 66513329117441. The next prime is 66513329117453. The reversal of 66513329117450 is 5471192331566.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66513329117392 and 66513329117401.

It is not an unprimeable number, because it can be changed into a prime (66513329117453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15506420 + ... + 19325519.

It is an arithmetic number, because the mean of its divisors is an integer number (2603913922610).

Almost surely, 2^{66513329117450} is an apocalyptic number.

66513329117450 is a deficient number, since it is larger than the sum of its proper divisors (58474539167830).

66513329117450 is a wasteful number, since it uses less digits than its factorization.

66513329117450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34832343 (or 34832338 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 66513329117450 in words is "sixty-six trillion, five hundred thirteen billion, three hundred twenty-nine million, one hundred seventeen thousand, four hundred fifty".