66695371157 has 2 divisors, whose sum is σ = 66695371158. Its totient is φ = 66695371156.

The previous prime is 66695371139. The next prime is 66695371207. The reversal of 66695371157 is 75117359666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41879985316 + 24815385841 = 204646^2 + 157529^2 .

It is a cyclic number.

It is not a de Polignac number, because 66695371157 - 2¹⁴ = 66695354773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66695371657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33347685578 + 33347685579.

It is an arithmetic number, because the mean of its divisors is an integer number (33347685579).

Almost surely, 2^66695371157 is an apocalyptic number.

It is an amenable number.

66695371157 is a deficient number, since it is larger than the sum of its proper divisors (1).

66695371157 is an equidigital number, since it uses as much as digits as its factorization.

66695371157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7144200, while the sum is 56.

The spelling of 66695371157 in words is "sixty-six billion, six hundred ninety-five million, three hundred seventy-one thousand, one hundred fifty-seven".