66052139 has 2 divisors, whose sum is σ = 66052140. Its totient is φ = 66052138.

The previous prime is 66052121. The next prime is 66052153. The reversal of 66052139 is 93125066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66052139 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66052109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33026069 + 33026070.

It is an arithmetic number, because the mean of its divisors is an integer number (33026070).

Almost surely, 2^66052139 is an apocalyptic number.

66052139 is a deficient number, since it is larger than the sum of its proper divisors (1).

66052139 is an equidigital number, since it uses as much as digits as its factorization.

66052139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 66052139 is about 8127.2467047580. The cubic root of 66052139 is about 404.2303913313.

The spelling of 66052139 in words is "sixty-six million, fifty-two thousand, one hundred thirty-nine".