66109749075 has 96 divisors (see below), whose sum is σ = 127631116800. Its totient is φ = 33507250560.

The previous prime is 66109749061. The next prime is 66109749103. The reversal of 66109749075 is 57094790166.

66109749075 is a `hidden beast` number, since 6 + 61 + 0 + 97 + 490 + 7 + 5 = 666.

It is not a de Polignac number, because 66109749075 - 2²⁴ = 66092971859 is a prime.

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, 1043146 + ... + 1104704.

It is an arithmetic number, because the mean of its divisors is an integer number (1329490800).

Almost surely, 2^66109749075 is an apocalyptic number.

66109749075 is a deficient number, since it is larger than the sum of its proper divisors (61521367725).

66109749075 is a wasteful number, since it uses less digits than its factorization.

66109749075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61658 (or 61647 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 66109749075 in words is "sixty-six billion, one hundred nine million, seven hundred forty-nine thousand, seventy-five".