64118999931641 has 8 divisors (see below), whose sum is σ = 65044682150280. Its totient is φ = 63194597165952.

The previous prime is 64118999931619. The next prime is 64118999931643. The reversal of 64118999931641 is 14613999981146.

It can be written as a sum of positive squares in 4 ways, for example, as 21532346967616 + 42586652964025 = 4640296^2 + 6525845^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64118999931641 - 2⁶ = 64118999931577 is a prime.

It is a super-2 number, since 2×64118999931641² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64118999931643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319762286 + ... + 319962743.

It is an arithmetic number, because the mean of its divisors is an integer number (8130585268785).

Almost surely, 2^{64118999931641} is an apocalyptic number.

It is an amenable number.

64118999931641 is a deficient number, since it is larger than the sum of its proper divisors (925682218639).

64118999931641 is a wasteful number, since it uses less digits than its factorization.

64118999931641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639726475.

The product of its digits is 90699264, while the sum is 71.

The spelling of 64118999931641 in words is "sixty-four trillion, one hundred eighteen billion, nine hundred ninety-nine million, nine hundred thirty-one thousand, six hundred forty-one".