66617371 has 2 divisors, whose sum is σ = 66617372. Its totient is φ = 66617370.

The previous prime is 66617311. The next prime is 66617381. The reversal of 66617371 is 17371666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66617371 - 2⁹ = 66616859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66617371.

It is not a weakly prime, because it can be changed into another prime (66617311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33308685 + 33308686.

It is an arithmetic number, because the mean of its divisors is an integer number (33308686).

Almost surely, 2^66617371 is an apocalyptic number.

66617371 is a deficient number, since it is larger than the sum of its proper divisors (1).

66617371 is an equidigital number, since it uses as much as digits as its factorization.

66617371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 37.

The square root of 66617371 is about 8161.9465202855. The cubic root of 66617371 is about 405.3801663272.

The spelling of 66617371 in words is "sixty-six million, six hundred seventeen thousand, three hundred seventy-one".