66279397 has 2 divisors, whose sum is σ = 66279398. Its totient is φ = 66279396.

The previous prime is 66279377. The next prime is 66279403. The reversal of 66279397 is 79397266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43678881 + 22600516 = 6609^2 + 4754^2 .

66279397 is a truncatable prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66279397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66279397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66279377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33139698 + 33139699.

It is an arithmetic number, because the mean of its divisors is an integer number (33139699).

Almost surely, 2^66279397 is an apocalyptic number.

It is an amenable number.

66279397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66279397 is an equidigital number, since it uses as much as digits as its factorization.

66279397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 49.

The square root of 66279397 is about 8141.2159411233. The cubic root of 66279397 is about 404.6934570075.

The spelling of 66279397 in words is "sixty-six million, two hundred seventy-nine thousand, three hundred ninety-seven".