66986371 has 2 divisors, whose sum is σ = 66986372. Its totient is φ = 66986370.

The previous prime is 66986351. The next prime is 66986407. The reversal of 66986371 is 17368966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66986371 - 2⁹ = 66985859 is a prime.

It is not a weakly prime, because it can be changed into another prime (66986321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33493185 + 33493186.

It is an arithmetic number, because the mean of its divisors is an integer number (33493186).

Almost surely, 2^66986371 is an apocalyptic number.

66986371 is a deficient number, since it is larger than the sum of its proper divisors (1).

66986371 is an equidigital number, since it uses as much as digits as its factorization.

66986371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 66986371 is about 8184.5202058520. The cubic root of 66986371 is about 406.1272684561.

The spelling of 66986371 in words is "sixty-six million, nine hundred eighty-six thousand, three hundred seventy-one".