64401563 has 2 divisors, whose sum is σ = 64401564. Its totient is φ = 64401562.

The previous prime is 64401553. The next prime is 64401577. The reversal of 64401563 is 36510446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64401563 - 2¹⁴ = 64385179 is a prime.

It is a super-2 number, since 2×64401563² = 8295122633685938, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (64401503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200781 + 32200782.

It is an arithmetic number, because the mean of its divisors is an integer number (32200782).

Almost surely, 2^64401563 is an apocalyptic number.

64401563 is a deficient number, since it is larger than the sum of its proper divisors (1).

64401563 is an equidigital number, since it uses as much as digits as its factorization.

64401563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 64401563 is about 8025.0584421548. The cubic root of 64401563 is about 400.8348459517.

The spelling of 64401563 in words is "sixty-four million, four hundred one thousand, five hundred sixty-three".