70643569 has 2 divisors, whose sum is σ = 70643570. Its totient is φ = 70643568.

The previous prime is 70643561. The next prime is 70643579. The reversal of 70643569 is 96534607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69105969 + 1537600 = 8313^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 70643569 - 2³ = 70643561 is a prime.

It is a super-2 number, since 2×70643569² = 9981027682115522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70643561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35321784 + 35321785.

It is an arithmetic number, because the mean of its divisors is an integer number (35321785).

Almost surely, 2^70643569 is an apocalyptic number.

It is an amenable number.

70643569 is a deficient number, since it is larger than the sum of its proper divisors (1).

70643569 is an equidigital number, since it uses as much as digits as its factorization.

70643569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 70643569 is about 8404.9728732459. The cubic root of 70643569 is about 413.3876939574.

The spelling of 70643569 in words is "seventy million, six hundred forty-three thousand, five hundred sixty-nine".