66564156157 has 2 divisors, whose sum is σ = 66564156158. Its totient is φ = 66564156156.

The previous prime is 66564156143. The next prime is 66564156167. The reversal of 66564156157 is 75165146566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40854919876 + 25709236281 = 202126^2 + 160341^2 .

It is a cyclic number.

It is not a de Polignac number, because 66564156157 - 2²³ = 66555767549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66564156167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33282078078 + 33282078079.

It is an arithmetic number, because the mean of its divisors is an integer number (33282078079).

Almost surely, 2^66564156157 is an apocalyptic number.

It is an amenable number.

66564156157 is a deficient number, since it is larger than the sum of its proper divisors (1).

66564156157 is an equidigital number, since it uses as much as digits as its factorization.

66564156157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536000, while the sum is 52.

The spelling of 66564156157 in words is "sixty-six billion, five hundred sixty-four million, one hundred fifty-six thousand, one hundred fifty-seven".