64158863616 has 135 divisors (see below), whose sum is σ = 191418944871. Its totient is φ = 21374129664.

The previous prime is 64158863609. The next prime is 64158863627. The reversal of 64158863616 is 61636885146.

The square root of 64158863616 is 253296.

It is a perfect power (a square), and thus also a powerful number.

64158863616 is a `hidden beast` number, since 6 + 4 + 15 + 8 + 8 + 6 + 3 + 616 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 36473745 + ... + 36475503.

Almost surely, 2^64158863616 is an apocalyptic number.

64158863616 is the 253296-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64158863616

64158863616 is an abundant number, since it is smaller than the sum of its proper divisors (127260081255).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64158863616 is an frugal number, since it uses more digits than its factorization.

64158863616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3546 (or 1764 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 64158863616 in words is "sixty-four billion, one hundred fifty-eight million, eight hundred sixty-three thousand, six hundred sixteen".