66157079 has 2 divisors, whose sum is σ = 66157080. Its totient is φ = 66157078.

The previous prime is 66157057. The next prime is 66157097. The reversal of 66157079 is 97075166.

Together with next prime (66157097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66157079 - 2²⁰ = 65108503 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66157879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078539 + 33078540.

It is an arithmetic number, because the mean of its divisors is an integer number (33078540).

Almost surely, 2^66157079 is an apocalyptic number.

66157079 is a deficient number, since it is larger than the sum of its proper divisors (1).

66157079 is an equidigital number, since it uses as much as digits as its factorization.

66157079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 66157079 is about 8133.7002034744. The cubic root of 66157079 is about 404.4443510552. Note that the first 3 decimals are identical.

The spelling of 66157079 in words is "sixty-six million, one hundred fifty-seven thousand, seventy-nine".