71664349 has 2 divisors, whose sum is σ = 71664350. Its totient is φ = 71664348.

The previous prime is 71664323. The next prime is 71664361. The reversal of 71664349 is 94346617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42016324 + 29648025 = 6482^2 + 5445^2 .

It is a cyclic number.

It is not a de Polignac number, because 71664349 - 2⁵ = 71664317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71664379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35832174 + 35832175.

It is an arithmetic number, because the mean of its divisors is an integer number (35832175).

Almost surely, 2^71664349 is an apocalyptic number.

It is an amenable number.

71664349 is a deficient number, since it is larger than the sum of its proper divisors (1).

71664349 is an equidigital number, since it uses as much as digits as its factorization.

71664349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 71664349 is about 8465.4798446396. The cubic root of 71664349 is about 415.3692924187.

The spelling of 71664349 in words is "seventy-one million, six hundred sixty-four thousand, three hundred forty-nine".