64569569 has 2 divisors, whose sum is σ = 64569570. Its totient is φ = 64569568.

The previous prime is 64569539. The next prime is 64569577. The reversal of 64569569 is 96596546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40195600 + 24373969 = 6340^2 + 4937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64569569 is a prime.

It is a super-2 number, since 2×64569569² = 8338458481691522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64569539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32284784 + 32284785.

It is an arithmetic number, because the mean of its divisors is an integer number (32284785).

Almost surely, 2^64569569 is an apocalyptic number.

It is an amenable number.

64569569 is a deficient number, since it is larger than the sum of its proper divisors (1).

64569569 is an equidigital number, since it uses as much as digits as its factorization.

64569569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 50.

The square root of 64569569 is about 8035.5192116005. The cubic root of 64569569 is about 401.1830993233.

The spelling of 64569569 in words is "sixty-four million, five hundred sixty-nine thousand, five hundred sixty-nine".