64642446040645 has 24 divisors (see below), whose sum is σ = 86709071806560. Its totient is φ = 46215862783200.

The previous prime is 64642446040643. The next prime is 64642446040729. The reversal of 64642446040645 is 54604064424646.

64642446040645 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 64642446040645 - 2¹ = 64642446040643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

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 23 ways as a sum of consecutive naturals, for example, 905447511 + ... + 905518900.

It is an arithmetic number, because the mean of its divisors is an integer number (3612877991940).

Almost surely, 2^{64642446040645} is an apocalyptic number.

It is an amenable number.

64642446040645 is a deficient number, since it is larger than the sum of its proper divisors (22066625765915).

64642446040645 is a wasteful number, since it uses less digits than its factorization.

64642446040645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810966497 (or 1810966486 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 55.

The spelling of 64642446040645 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-six million, forty thousand, six hundred forty-five".