70566521 has 2 divisors, whose sum is σ = 70566522. Its totient is φ = 70566520.

The previous prime is 70566497. The next prime is 70566539. The reversal of 70566521 is 12566507.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41783296 + 28783225 = 6464^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 70566521 - 2²² = 66372217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70562521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35283260 + 35283261.

It is an arithmetic number, because the mean of its divisors is an integer number (35283261).

Almost surely, 2^70566521 is an apocalyptic number.

It is an amenable number.

70566521 is a deficient number, since it is larger than the sum of its proper divisors (1).

70566521 is an equidigital number, since it uses as much as digits as its factorization.

70566521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 70566521 is about 8400.3881457942. The cubic root of 70566521 is about 413.2373510367.

The spelling of 70566521 in words is "seventy million, five hundred sixty-six thousand, five hundred twenty-one".