66158369 has 2 divisors, whose sum is σ = 66158370. Its totient is φ = 66158368.

The previous prime is 66158341. The next prime is 66158377. The reversal of 66158369 is 96385166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46240000 + 19918369 = 6800^2 + 4463^2 .

It is a cyclic number.

It is not a de Polignac number, because 66158369 - 2¹² = 66154273 is a prime.

It is a super-2 number, since 2×66158369² = 8753859577480322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66158269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33079184 + 33079185.

It is an arithmetic number, because the mean of its divisors is an integer number (33079185).

Almost surely, 2^66158369 is an apocalyptic number.

It is an amenable number.

66158369 is a deficient number, since it is larger than the sum of its proper divisors (1).

66158369 is an equidigital number, since it uses as much as digits as its factorization.

66158369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 66158369 is about 8133.7795027896. The cubic root of 66158369 is about 404.4469797979.

The spelling of 66158369 in words is "sixty-six million, one hundred fifty-eight thousand, three hundred sixty-nine".