64327427481 has 4 divisors (see below), whose sum is σ = 85769903312. Its totient is φ = 42884951652.

The previous prime is 64327427473. The next prime is 64327427497. The reversal of 64327427481 is 18472472346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64327427481 - 2³ = 64327427473 is a prime.

It is a super-2 number, since 2×64327427481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64327427481.

It is not an unprimeable number, because it can be changed into a prime (64327427581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10721237911 + ... + 10721237916.

It is an arithmetic number, because the mean of its divisors is an integer number (21442475828).

Almost surely, 2^64327427481 is an apocalyptic number.

It is an amenable number.

64327427481 is a deficient number, since it is larger than the sum of its proper divisors (21442475831).

64327427481 is a wasteful number, since it uses less digits than its factorization.

64327427481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21442475830.

The product of its digits is 1806336, while the sum is 48.

The spelling of 64327427481 in words is "sixty-four billion, three hundred twenty-seven million, four hundred twenty-seven thousand, four hundred eighty-one".