64651681473 has 16 divisors (see below), whose sum is σ = 87466899456. Its totient is φ = 42469494480.

The previous prime is 64651681469. The next prime is 64651681487. The reversal of 64651681473 is 37418615646.

64651681473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64651681473 - 2² = 64651681469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64651681453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285240 + ... + 458982.

It is an arithmetic number, because the mean of its divisors is an integer number (5466681216).

Almost surely, 2^64651681473 is an apocalyptic number.

It is an amenable number.

64651681473 is a deficient number, since it is larger than the sum of its proper divisors (22815217983).

64651681473 is a wasteful number, since it uses less digits than its factorization.

64651681473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175564.

The product of its digits is 2903040, while the sum is 51.

The spelling of 64651681473 in words is "sixty-four billion, six hundred fifty-one million, six hundred eighty-one thousand, four hundred seventy-three".