66798484765157 has 4 divisors (see below), whose sum is σ = 67713532501740. Its totient is φ = 65883437028576.

The previous prime is 66798484765121. The next prime is 66798484765211. The reversal of 66798484765157 is 75156748489766.

It is a Cunningham number, because it is equal to 8173034²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37918082110756 + 28880402654401 = 6157766^2 + 5374049^2 .

It is a cyclic number.

It is not a de Polignac number, because 66798484765157 - 2⁸ = 66798484764901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66798484765457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457523868182 + ... + 457523868327.

It is an arithmetic number, because the mean of its divisors is an integer number (16928383125435).

Almost surely, 2^{66798484765157} is an apocalyptic number.

It is an amenable number.

66798484765157 is a deficient number, since it is larger than the sum of its proper divisors (915047736583).

66798484765157 is an equidigital number, since it uses as much as digits as its factorization.

66798484765157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915047736582.

The product of its digits is 17069875200, while the sum is 83.

The spelling of 66798484765157 in words is "sixty-six trillion, seven hundred ninety-eight billion, four hundred eighty-four million, seven hundred sixty-five thousand, one hundred fifty-seven".