64981795481 has 32 divisors (see below), whose sum is σ = 72973716480. Its totient is φ = 57605990400.

The previous prime is 64981795457. The next prime is 64981795523. The reversal of 64981795481 is 18459718946.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64981795481 is a prime.

It is a super-2 number, since 2×64981795481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64981795441) 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 31 ways as a sum of consecutive naturals, for example, 2716931 + ... + 2740743.

It is an arithmetic number, because the mean of its divisors is an integer number (2280428640).

Almost surely, 2^64981795481 is an apocalyptic number.

It is an amenable number.

64981795481 is a deficient number, since it is larger than the sum of its proper divisors (7991920999).

64981795481 is a wasteful number, since it uses less digits than its factorization.

64981795481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24017.

The product of its digits is 17418240, while the sum is 62.

The spelling of 64981795481 in words is "sixty-four billion, nine hundred eighty-one million, seven hundred ninety-five thousand, four hundred eighty-one".