64766178064 has 135 divisors (see below), whose sum is σ = 149406622911. Its totient is φ = 27118667520.

The previous prime is 64766178031. The next prime is 64766178079. The reversal of 64766178064 is 46087166746.

The square root of 64766178064 is 254492.

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

It can be written as a sum of positive squares in 4 ways, for example, as 48176738064 + 16589440000 = 219492^2 + 128800^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64766177996 and 64766178014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 434672262 + ... + 434672410.

Almost surely, 2^64766178064 is an apocalyptic number.

64766178064 is the 254492-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64766178064

64766178064 is an abundant number, since it is smaller than the sum of its proper divisors (84640444847).

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

64766178064 is an equidigital number, since it uses as much as digits as its factorization.

64766178064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 64766178064 in words is "sixty-four billion, seven hundred sixty-six million, one hundred seventy-eight thousand, sixty-four".