64847681457 has 16 divisors (see below), whose sum is σ = 93155462400. Its totient is φ = 39888761472.

The previous prime is 64847681417. The next prime is 64847681471. The reversal of 64847681457 is 75418674846.

It is not a de Polignac number, because 64847681457 - 2⁷ = 64847681329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64847681457.

It is not an unprimeable number, because it can be changed into a prime (64847681417) 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 15 ways as a sum of consecutive naturals, for example, 274332 + ... + 452717.

It is an arithmetic number, because the mean of its divisors is an integer number (5822216400).

Almost surely, 2^64847681457 is an apocalyptic number.

It is an amenable number.

64847681457 is a deficient number, since it is larger than the sum of its proper divisors (28307780943).

64847681457 is a wasteful number, since it uses less digits than its factorization.

64847681457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729352.

The product of its digits is 36126720, while the sum is 60.

The spelling of 64847681457 in words is "sixty-four billion, eight hundred forty-seven million, six hundred eighty-one thousand, four hundred fifty-seven".