64044631645 has 16 divisors (see below), whose sum is σ = 77181527808. Its totient is φ = 51017176000.

The previous prime is 64044631643. The next prime is 64044631649. The reversal of 64044631645 is 54613644046.

It is not a de Polignac number, because 64044631645 - 2¹ = 64044631643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64044631643) 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, 7886127 + ... + 7894243.

It is an arithmetic number, because the mean of its divisors is an integer number (4823845488).

Almost surely, 2^64044631645 is an apocalyptic number.

It is an amenable number.

64044631645 is a deficient number, since it is larger than the sum of its proper divisors (13136896163).

64044631645 is a wasteful number, since it uses less digits than its factorization.

64044631645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14660.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 64044631645 in words is "sixty-four billion, forty-four million, six hundred thirty-one thousand, six hundred forty-five".