66597161157 has 12 divisors (see below), whose sum is σ = 99512999820. Its totient is φ = 42867138048.

The previous prime is 66597161153. The next prime is 66597161171. The reversal of 66597161157 is 75116179566.

It can be written as a sum of positive squares in 2 ways, for example, as 31145543361 + 35451617796 = 176481^2 + 188286^2 .

It is not a de Polignac number, because 66597161157 - 2² = 66597161153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66597161153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127580508 + ... + 127581029.

It is an arithmetic number, because the mean of its divisors is an integer number (8292749985).

Almost surely, 2^66597161157 is an apocalyptic number.

It is an amenable number.

66597161157 is a deficient number, since it is larger than the sum of its proper divisors (32915838663).

66597161157 is a wasteful number, since it uses less digits than its factorization.

66597161157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255161572 (or 255161569 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 54.

The spelling of 66597161157 in words is "sixty-six billion, five hundred ninety-seven million, one hundred sixty-one thousand, one hundred fifty-seven".