64481020547 has 4 divisors (see below), whose sum is σ = 64508104416. Its totient is φ = 64453936680.

The previous prime is 64481020501. The next prime is 64481020567. The reversal of 64481020547 is 74502018446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64481020547 - 2¹² = 64481016451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64481020567) 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 3 ways as a sum of consecutive naturals, for example, 13538363 + ... + 13543124.

It is an arithmetic number, because the mean of its divisors is an integer number (16127026104).

Almost surely, 2^64481020547 is an apocalyptic number.

64481020547 is a deficient number, since it is larger than the sum of its proper divisors (27083869).

64481020547 is a wasteful number, since it uses less digits than its factorization.

64481020547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27083868.

The product of its (nonzero) digits is 215040, while the sum is 41.

The spelling of 64481020547 in words is "sixty-four billion, four hundred eighty-one million, twenty thousand, five hundred forty-seven".