64664188146646 has 32 divisors (see below), whose sum is σ = 106806633447168. Its totient is φ = 29117134767840.

The previous prime is 64664188146641. The next prime is 64664188146659.

64664188146646 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664188146641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71993311 + ... + 72885973.

It is an arithmetic number, because the mean of its divisors is an integer number (3337707295224).

Almost surely, 2^{64664188146646} is an apocalyptic number.

64664188146646 is a deficient number, since it is larger than the sum of its proper divisors (42142445300522).

64664188146646 is a wasteful number, since it uses less digits than its factorization.

64664188146646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923556.

The product of its digits is 764411904, while the sum is 70.

The spelling of 64664188146646 in words is "sixty-four trillion, six hundred sixty-four billion, one hundred eighty-eight million, one hundred forty-six thousand, six hundred forty-six".