64623531569 has 2 divisors, whose sum is σ = 64623531570. Its totient is φ = 64623531568.

The previous prime is 64623531563. The next prime is 64623531617. The reversal of 64623531569 is 96513532646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64255659169 + 367872400 = 253487^2 + 19180^2 .

It is a cyclic number.

It is not a de Polignac number, because 64623531569 - 2³² = 60328564273 is a prime.

It is a super-2 number, since 2×64623531569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64623531563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32311765784 + 32311765785.

It is an arithmetic number, because the mean of its divisors is an integer number (32311765785).

Almost surely, 2^64623531569 is an apocalyptic number.

It is an amenable number.

64623531569 is a deficient number, since it is larger than the sum of its proper divisors (1).

64623531569 is an equidigital number, since it uses as much as digits as its factorization.

64623531569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 50.

The spelling of 64623531569 in words is "sixty-four billion, six hundred twenty-three million, five hundred thirty-one thousand, five hundred sixty-nine".