64448707557 has 32 divisors (see below), whose sum is σ = 95099468800. Its totient is φ = 38565849600.

The previous prime is 64448707553. The next prime is 64448707607. The reversal of 64448707557 is 75570784446.

It is not a de Polignac number, because 64448707557 - 2² = 64448707553 is a prime.

It is the 253868-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64448707497 and 64448707506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64448707553) by changing a digit.

It is a nontrivial repunit in base 253867.

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 31 ways as a sum of consecutive naturals, for example, 2586444 + ... + 2611242.

It is an arithmetic number, because the mean of its divisors is an integer number (2971858400).

Almost surely, 2^64448707557 is an apocalyptic number.

It is an amenable number.

64448707557 is a deficient number, since it is larger than the sum of its proper divisors (30650761243).

64448707557 is a wasteful number, since it uses less digits than its factorization.

64448707557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26653.

The product of its (nonzero) digits is 26342400, while the sum is 57.

The spelling of 64448707557 in words is "sixty-four billion, four hundred forty-eight million, seven hundred seven thousand, five hundred fifty-seven".