66997379 has 4 divisors (see below), whose sum is σ = 67200120. Its totient is φ = 66794640.

The previous prime is 66997349. The next prime is 66997393. The reversal of 66997379 is 97379966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97379966 = 2 ⋅48689983.

It is a cyclic number.

It is not a de Polignac number, because 66997379 - 2⁸ = 66997123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66997319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100874 + ... + 101535.

It is an arithmetic number, because the mean of its divisors is an integer number (16800030).

Almost surely, 2^66997379 is an apocalyptic number.

66997379 is a deficient number, since it is larger than the sum of its proper divisors (202741).

66997379 is a wasteful number, since it uses less digits than its factorization.

66997379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202740.

The product of its digits is 3857868, while the sum is 56.

The square root of 66997379 is about 8185.1926672498. The cubic root of 66997379 is about 406.1495137976.

It can be divided in two parts, 66997 and 379, that added together give a palindrome (67376).

The spelling of 66997379 in words is "sixty-six million, nine hundred ninety-seven thousand, three hundred seventy-nine".