64335401643 has 16 divisors (see below), whose sum is σ = 89160374016. Its totient is φ = 41228281440.

The previous prime is 64335401639. The next prime is 64335401677. The reversal of 64335401643 is 34610453346.

It is not a de Polignac number, because 64335401643 - 2² = 64335401639 is a prime.

It is a super-2 number, since 2×64335401643² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64335401623) 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, 3482343 + ... + 3500768.

It is an arithmetic number, because the mean of its divisors is an integer number (5572523376).

Almost surely, 2^64335401643 is an apocalyptic number.

64335401643 is a deficient number, since it is larger than the sum of its proper divisors (24824972373).

64335401643 is a wasteful number, since it uses less digits than its factorization.

64335401643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6983234.

The product of its (nonzero) digits is 311040, while the sum is 39.

Adding to 64335401643 its reverse (34610453346), we get a palindrome (98945854989).

The spelling of 64335401643 in words is "sixty-four billion, three hundred thirty-five million, four hundred one thousand, six hundred forty-three".