70664261 has 2 divisors, whose sum is σ = 70664262. Its totient is φ = 70664260.

The previous prime is 70664239. The next prime is 70664263. The reversal of 70664261 is 16246607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70040161 + 624100 = 8369^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 70664261 - 2¹⁴ = 70647877 is a prime.

It is a super-2 number, since 2×70664261² = 9986875565352242, which contains 22 as substring.

Together with 70664263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70664263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35332130 + 35332131.

It is an arithmetic number, because the mean of its divisors is an integer number (35332131).

Almost surely, 2^70664261 is an apocalyptic number.

It is an amenable number.

70664261 is a deficient number, since it is larger than the sum of its proper divisors (1).

70664261 is an equidigital number, since it uses as much as digits as its factorization.

70664261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 70664261 is about 8406.2037210622. The cubic root of 70664261 is about 413.4280514085.

The spelling of 70664261 in words is "seventy million, six hundred sixty-four thousand, two hundred sixty-one".