64986968947 has 16 divisors (see below), whose sum is σ = 70040033280. Its totient is φ = 60121828800.

The previous prime is 64986968933. The next prime is 64986969049. The reversal of 64986968947 is 74986968946.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64986968947 is a prime.

It is a super-2 number, since 2×64986968947² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64986965947) 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, 1266079 + ... + 1316407.

It is an arithmetic number, because the mean of its divisors is an integer number (4377502080).

Almost surely, 2^64986968947 is an apocalyptic number.

64986968947 is a deficient number, since it is larger than the sum of its proper divisors (5053064333).

64986968947 is a wasteful number, since it uses less digits than its factorization.

64986968947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52194.

The product of its digits is 1128701952, while the sum is 76.

Subtracting 64986968947 from its reverse (74986968946), we obtain a palindrome (9999999999).

The spelling of 64986968947 in words is "sixty-four billion, nine hundred eighty-six million, nine hundred sixty-eight thousand, nine hundred forty-seven".