66874425805 has 12 divisors (see below), whose sum is σ = 88207921116. Its totient is φ = 48635945600.

The previous prime is 66874425769. The next prime is 66874425817. The reversal of 66874425805 is 50852447866.

It can be written as a sum of positive squares in 2 ways, for example, as 11699234569 + 55175191236 = 108163^2 + 234894^2 .

It is not a de Polignac number, because 66874425805 - 2⁷ = 66874425677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55267516 + ... + 55268725.

It is an arithmetic number, because the mean of its divisors is an integer number (7350660093).

Almost surely, 2^66874425805 is an apocalyptic number.

It is an amenable number.

66874425805 is a deficient number, since it is larger than the sum of its proper divisors (21333495311).

66874425805 is a wasteful number, since it uses less digits than its factorization.

66874425805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110536268 (or 110536257 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 55.

The spelling of 66874425805 in words is "sixty-six billion, eight hundred seventy-four million, four hundred twenty-five thousand, eight hundred five".