66758571873 has 16 divisors (see below), whose sum is σ = 113030386560. Its totient is φ = 38147755248.

The previous prime is 66758571871. The next prime is 66758571877. The reversal of 66758571873 is 37817585766.

66758571873 is a `hidden beast` number, since 6 + 6 + 7 + 58 + 571 + 8 + 7 + 3 = 666.

It is not a de Polignac number, because 66758571873 - 2¹ = 66758571871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 66758571873.

It is not an unprimeable number, because it can be changed into a prime (66758571871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176609790 + ... + 176610167.

It is an arithmetic number, because the mean of its divisors is an integer number (7064399160).

Almost surely, 2^66758571873 is an apocalyptic number.

66758571873 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

66758571873 is a deficient number, since it is larger than the sum of its proper divisors (46271814687).

66758571873 is a wasteful number, since it uses less digits than its factorization.

66758571873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353219973 (or 353219967 counting only the distinct ones).

The product of its digits is 59270400, while the sum is 63.

The spelling of 66758571873 in words is "sixty-six billion, seven hundred fifty-eight million, five hundred seventy-one thousand, eight hundred seventy-three".