64439188552 has 8 divisors (see below), whose sum is σ = 120823478550. Its totient is φ = 32219594272.

The previous prime is 64439188547. The next prime is 64439188577. The reversal of 64439188552 is 25588193446.

It can be written as a sum of positive squares in only one way, i.e., 64255152196 + 184036356 = 253486^2 + 13566^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 64439188493 and 64439188502.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4027449277 + ... + 4027449292.

Almost surely, 2^64439188552 is an apocalyptic number.

It is an amenable number.

64439188552 is a deficient number, since it is larger than the sum of its proper divisors (56384289998).

64439188552 is a wasteful number, since it uses less digits than its factorization.

64439188552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054898575 (or 8054898571 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 55.

The spelling of 64439188552 in words is "sixty-four billion, four hundred thirty-nine million, one hundred eighty-eight thousand, five hundred fifty-two".