66477139 has 2 divisors, whose sum is σ = 66477140. Its totient is φ = 66477138.

The previous prime is 66477121. The next prime is 66477149. The reversal of 66477139 is 93177466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66477139 - 2²⁵ = 32922707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66477095 and 66477104.

It is not a weakly prime, because it can be changed into another prime (66477149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33238569 + 33238570.

It is an arithmetic number, because the mean of its divisors is an integer number (33238570).

Almost surely, 2^66477139 is an apocalyptic number.

66477139 is a deficient number, since it is larger than the sum of its proper divisors (1).

66477139 is an equidigital number, since it uses as much as digits as its factorization.

66477139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 66477139 is about 8153.3513968184. The cubic root of 66477139 is about 405.0955198159.

The spelling of 66477139 in words is "sixty-six million, four hundred seventy-seven thousand, one hundred thirty-nine".