64163511561 has 8 divisors (see below), whose sum is σ = 85554540864. Its totient is φ = 42774078320.

The previous prime is 64163511551. The next prime is 64163511563. The reversal of 64163511561 is 16511536146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64163511561 - 2¹⁸ = 64163249417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64163511563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301830 + ... + 468431.

It is an arithmetic number, because the mean of its divisors is an integer number (10694317608).

Almost surely, 2^64163511561 is an apocalyptic number.

It is an amenable number.

64163511561 is a deficient number, since it is larger than the sum of its proper divisors (21391029303).

64163511561 is a wasteful number, since it uses less digits than its factorization.

64163511561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798031.

The product of its digits is 64800, while the sum is 39.

The spelling of 64163511561 in words is "sixty-four billion, one hundred sixty-three million, five hundred eleven thousand, five hundred sixty-one".