64536448637 has 8 divisors (see below), whose sum is σ = 65049002040. Its totient is φ = 64025902080.

The previous prime is 64536448633. The next prime is 64536448657. The reversal of 64536448637 is 73684463546.

It can be written as a sum of positive squares in 4 ways, for example, as 23931780601 + 40604668036 = 154699^2 + 201506^2 .

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 64536448637 - 2² = 64536448633 is a prime.

It is a super-2 number, since 2×64536448637² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64536448633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437108 + ... + 565805.

It is an arithmetic number, because the mean of its divisors is an integer number (8131125255).

Almost surely, 2^64536448637 is an apocalyptic number.

It is an amenable number.

64536448637 is a deficient number, since it is larger than the sum of its proper divisors (512553403).

64536448637 is a wasteful number, since it uses less digits than its factorization.

64536448637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003423.

The product of its digits is 34836480, while the sum is 56.

The spelling of 64536448637 in words is "sixty-four billion, five hundred thirty-six million, four hundred forty-eight thousand, six hundred thirty-seven".