64936640238080 has 320 divisors, whose sum is σ = 170248624828128. Its totient is φ = 23609286328320.

The previous prime is 64936640238059. The next prime is 64936640238097. The reversal of 64936640238080 is 8083204663946.

It can be written as a sum of positive squares in 16 ways, for example, as 336455682304 + 64600184555776 = 580048^2 + 8037424^2 .

It is a tau number, because it is divible by the number of its divisors (320).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1498942820 + ... + 1498986140.

Almost surely, 2^{64936640238080} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64936640238080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85124312414064).

64936640238080 is an abundant number, since it is smaller than the sum of its proper divisors (105311984590048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64936640238080 is a wasteful number, since it uses less digits than its factorization.

64936640238080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44047 (or 44031 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 59.

The spelling of 64936640238080 in words is "sixty-four trillion, nine hundred thirty-six billion, six hundred forty million, two hundred thirty-eight thousand, eighty".