642465436544 has 16 divisors (see below), whose sum is σ = 1279911612120. Its totient is φ = 321232718208.

The previous prime is 642465436541. The next prime is 642465436601. The reversal of 642465436544 is 445634564246.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642465436541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2509630484 + ... + 2509630739.

Almost surely, 2^642465436544 is an apocalyptic number.

642465436544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

642465436544 is a deficient number, since it is larger than the sum of its proper divisors (637446175576).

642465436544 is an equidigital number, since it uses as much as digits as its factorization.

642465436544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5019261237 (or 5019261225 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 53.

The spelling of 642465436544 in words is "six hundred forty-two billion, four hundred sixty-five million, four hundred thirty-six thousand, five hundred forty-four".