66387137 has 2 divisors, whose sum is σ = 66387138. Its totient is φ = 66387136.

The previous prime is 66387133. The next prime is 66387143. The reversal of 66387137 is 73178366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63425296 + 2961841 = 7964^2 + 1721^2 .

It is a cyclic number.

It is not a de Polignac number, because 66387137 - 2² = 66387133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66387094 and 66387103.

It is not a weakly prime, because it can be changed into another prime (66387133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33193568 + 33193569.

It is an arithmetic number, because the mean of its divisors is an integer number (33193569).

Almost surely, 2^66387137 is an apocalyptic number.

It is an amenable number.

66387137 is a deficient number, since it is larger than the sum of its proper divisors (1).

66387137 is an equidigital number, since it uses as much as digits as its factorization.

66387137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 66387137 is about 8147.8302019617. The cubic root of 66387137 is about 404.9126204825.

The spelling of 66387137 in words is "sixty-six million, three hundred eighty-seven thousand, one hundred thirty-seven".