64642446040646 has 8 divisors (see below), whose sum is σ = 101179480759344. Its totient is φ = 30915952454200.

The previous prime is 64642446040643. The next prime is 64642446040729. The reversal of 64642446040646 is 64604064424646.

It is a happy number.

64642446040646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 64642446040591 and 64642446040600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642446040643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702635283005 + ... + 702635283096.

It is an arithmetic number, because the mean of its divisors is an integer number (12647435094918).

Almost surely, 2^{64642446040646} is an apocalyptic number.

64642446040646 is a deficient number, since it is larger than the sum of its proper divisors (36537034718698).

64642446040646 is a wasteful number, since it uses less digits than its factorization.

64642446040646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405270566126.

The product of its (nonzero) digits is 63700992, while the sum is 56.

The spelling of 64642446040646 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-six million, forty thousand, six hundred forty-six".