64563513511 has 4 divisors (see below), whose sum is σ = 73786872592. Its totient is φ = 55340154432.

The previous prime is 64563513503. The next prime is 64563513517. The reversal of 64563513511 is 11531536546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64563513511 - 2³ = 64563513503 is a prime.

It is a super-3 number, since 3×64563513511³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64563513517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4611679530 + ... + 4611679543.

It is an arithmetic number, because the mean of its divisors is an integer number (18446718148).

Almost surely, 2^64563513511 is an apocalyptic number.

64563513511 is a deficient number, since it is larger than the sum of its proper divisors (9223359081).

64563513511 is an equidigital number, since it uses as much as digits as its factorization.

64563513511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9223359080.

The product of its digits is 162000, while the sum is 40.

The spelling of 64563513511 in words is "sixty-four billion, five hundred sixty-three million, five hundred thirteen thousand, five hundred eleven".