64642446040647 has 8 divisors (see below), whose sum is σ = 86206804896256. Its totient is φ = 43086525606072.

The previous prime is 64642446040643. The next prime is 64642446040729. The reversal of 64642446040647 is 74604064424646.

It is a happy number.

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

It is not a de Polignac number, because 64642446040647 - 2² = 64642446040643 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109587383 + ... + 2109618024.

It is an arithmetic number, because the mean of its divisors is an integer number (10775850612032).

Almost surely, 2^{64642446040647} is an apocalyptic number.

64642446040647 is a deficient number, since it is larger than the sum of its proper divisors (21564358855609).

64642446040647 is a wasteful number, since it uses less digits than its factorization.

64642446040647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219210517.

The product of its (nonzero) digits is 74317824, while the sum is 57.

The spelling of 64642446040647 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-six million, forty thousand, six hundred forty-seven".