66498979 has 2 divisors, whose sum is σ = 66498980. Its totient is φ = 66498978.

The previous prime is 66498977. The next prime is 66499039. The reversal of 66498979 is 97989466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66498979 - 2¹ = 66498977 is a prime.

It is a super-2 number, since 2×66498979² = 8844228416084882, which contains 22 as substring.

Together with 66498977, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66498973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33249489 + 33249490.

It is an arithmetic number, because the mean of its divisors is an integer number (33249490).

Almost surely, 2^66498979 is an apocalyptic number.

66498979 is a deficient number, since it is larger than the sum of its proper divisors (1).

66498979 is an equidigital number, since it uses as much as digits as its factorization.

66498979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 58.

The square root of 66498979 is about 8154.6906133832. The cubic root of 66498979 is about 405.1398775083.

The spelling of 66498979 in words is "sixty-six million, four hundred ninety-eight thousand, nine hundred seventy-nine".