66996379 has 2 divisors, whose sum is σ = 66996380. Its totient is φ = 66996378.

The previous prime is 66996373. The next prime is 66996383. The reversal of 66996379 is 97369966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66996379 - 2²¹ = 64899227 is a prime.

It is a super-2 number, since 2×66996379² = 8977029598223282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66996373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33498189 + 33498190.

It is an arithmetic number, because the mean of its divisors is an integer number (33498190).

Almost surely, 2^66996379 is an apocalyptic number.

66996379 is a deficient number, since it is larger than the sum of its proper divisors (1).

66996379 is an equidigital number, since it uses as much as digits as its factorization.

66996379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 55.

The square root of 66996379 is about 8185.1315811049. The cubic root of 66996379 is about 406.1474930642.

The spelling of 66996379 in words is "sixty-six million, nine hundred ninety-six thousand, three hundred seventy-nine".