64378685361 has 16 divisors (see below), whose sum is σ = 87674022144. Its totient is φ = 42001432704.

The previous prime is 64378685351. The next prime is 64378685363. The reversal of 64378685361 is 16358687346.

It is not a de Polignac number, because 64378685361 - 2⁹ = 64378684849 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64378685363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1738111 + ... + 1774763.

It is an arithmetic number, because the mean of its divisors is an integer number (5479626384).

Almost surely, 2^64378685361 is an apocalyptic number.

It is an amenable number.

64378685361 is a deficient number, since it is larger than the sum of its proper divisors (23295336783).

64378685361 is a wasteful number, since it uses less digits than its factorization.

64378685361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49160.

The product of its digits is 17418240, while the sum is 57.

The spelling of 64378685361 in words is "sixty-four billion, three hundred seventy-eight million, six hundred eighty-five thousand, three hundred sixty-one".