64393938801 has 24 divisors (see below), whose sum is σ = 100099367784. Its totient is φ = 39741672960.

The previous prime is 64393938779. The next prime is 64393938871. The reversal of 64393938801 is 10883939346.

It can be written as a sum of positive squares in 4 ways, for example, as 21002965776 + 43390973025 = 144924^2 + 208305^2 .

It is not a de Polignac number, because 64393938801 - 2⁹ = 64393938289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64393938871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3440466 + ... + 3459131.

It is an arithmetic number, because the mean of its divisors is an integer number (4170806991).

Almost surely, 2^64393938801 is an apocalyptic number.

64393938801 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64393938801 is a deficient number, since it is larger than the sum of its proper divisors (35705428983).

64393938801 is a wasteful number, since it uses less digits than its factorization.

64393938801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6899681 (or 6899678 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 64393938801 in words is "sixty-four billion, three hundred ninety-three million, nine hundred thirty-eight thousand, eight hundred one".