64109839993345 has 4 divisors (see below), whose sum is σ = 76931807992020. Its totient is φ = 51287871994672.

The previous prime is 64109839993343. The next prime is 64109839993349. The reversal of 64109839993345 is 54339993890146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21550030124401 + 42559809868944 = 4642201^2 + 6523788^2 .

It is a cyclic number.

It is not a de Polignac number, because 64109839993345 - 2¹ = 64109839993343 is a prime.

It is a super-2 number, since 2×64109839993345² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64109839993343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6410983999330 + ... + 6410983999339.

It is an arithmetic number, because the mean of its divisors is an integer number (19232951998005).

Almost surely, 2^{64109839993345} is an apocalyptic number.

It is an amenable number.

64109839993345 is a deficient number, since it is larger than the sum of its proper divisors (12821967998675).

64109839993345 is a wasteful number, since it uses less digits than its factorization.

64109839993345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12821967998674.

The product of its (nonzero) digits is 680244480, while the sum is 73.

The spelling of 64109839993345 in words is "sixty-four trillion, one hundred nine billion, eight hundred thirty-nine million, nine hundred ninety-three thousand, three hundred forty-five".