66155020793 has 2 divisors, whose sum is σ = 66155020794. Its totient is φ = 66155020792.

The previous prime is 66155020747. The next prime is 66155020817. The reversal of 66155020793 is 39702055166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56049142009 + 10105878784 = 236747^2 + 100528^2 .

It is a cyclic number.

It is not a de Polignac number, because 66155020793 - 2²⁰ = 66153972217 is a prime.

It is a super-2 number, since 2×66155020793² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66155020703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33077510396 + 33077510397.

It is an arithmetic number, because the mean of its divisors is an integer number (33077510397).

Almost surely, 2^66155020793 is an apocalyptic number.

It is an amenable number.

66155020793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66155020793 is an equidigital number, since it uses as much as digits as its factorization.

66155020793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 44.

The spelling of 66155020793 in words is "sixty-six billion, one hundred fifty-five million, twenty thousand, seven hundred ninety-three".