64427615645 has 8 divisors (see below), whose sum is σ = 77832019800. Its totient is φ = 51196171840.

The previous prime is 64427615627. The next prime is 64427615647. The reversal of 64427615645 is 54651672446.

64427615645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2074529209 + 62353086436 = 45547^2 + 249706^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64427615645 - 2¹⁰ = 64427614621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64427615593 and 64427615602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64427615647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43239266 + ... + 43240755.

It is an arithmetic number, because the mean of its divisors is an integer number (9729002475).

Almost surely, 2^64427615645 is an apocalyptic number.

It is an amenable number.

64427615645 is a deficient number, since it is larger than the sum of its proper divisors (13404404155).

64427615645 is a wasteful number, since it uses less digits than its factorization.

64427615645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86480175.

The product of its digits is 4838400, while the sum is 50.

The spelling of 64427615645 in words is "sixty-four billion, four hundred twenty-seven million, six hundred fifteen thousand, six hundred forty-five".