64719478989 has 12 divisors (see below), whose sum is σ = 101982209472. Its totient is φ = 39223926600.

The previous prime is 64719478981. The next prime is 64719479047. The reversal of 64719478989 is 98987491746.

64719478989 is a `hidden beast` number, since 6 + 4 + 71 + 9 + 478 + 9 + 89 = 666.

It is not a de Polignac number, because 64719478989 - 2³ = 64719478981 is a prime.

It is a super-2 number, since 2×64719478989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64719478981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326865957 + ... + 326866154.

It is an arithmetic number, because the mean of its divisors is an integer number (8498517456).

Almost surely, 2^64719478989 is an apocalyptic number.

It is an amenable number.

64719478989 is a deficient number, since it is larger than the sum of its proper divisors (37262730483).

64719478989 is a wasteful number, since it uses less digits than its factorization.

64719478989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653732128 (or 653732125 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 72.

The spelling of 64719478989 in words is "sixty-four billion, seven hundred nineteen million, four hundred seventy-eight thousand, nine hundred eighty-nine".