642064255445 has 16 divisors (see below), whose sum is σ = 794220803328. Its totient is φ = 497924729280.

The previous prime is 642064255411. The next prime is 642064255447. The reversal of 642064255445 is 544552460246.

It is a happy number.

It is not a de Polignac number, because 642064255445 - 2⁶ = 642064255381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642064255445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642064255447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6353219 + ... + 6453488.

It is an arithmetic number, because the mean of its divisors is an integer number (49638800208).

Almost surely, 2^642064255445 is an apocalyptic number.

It is an amenable number.

642064255445 is a deficient number, since it is larger than the sum of its proper divisors (152156547883).

642064255445 is a wasteful number, since it uses less digits than its factorization.

642064255445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12807020.

The product of its (nonzero) digits is 4608000, while the sum is 47.

The spelling of 642064255445 in words is "six hundred forty-two billion, sixty-four million, two hundred fifty-five thousand, four hundred forty-five".