642708818653 has 16 divisors (see below), whose sum is σ = 728203815360. Its totient is φ = 561885520000.

The previous prime is 642708818627. The next prime is 642708818657. The reversal of 642708818653 is 356818807246.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 642708818653 - 2¹³ = 642708810461 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 (642708818657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3933400 + ... + 4093537.

It is an arithmetic number, because the mean of its divisors is an integer number (45512738460).

Almost surely, 2^642708818653 is an apocalyptic number.

It is an amenable number.

642708818653 is a deficient number, since it is larger than the sum of its proper divisors (85494996707).

642708818653 is a wasteful number, since it uses less digits than its factorization.

642708818653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8027228.

The product of its (nonzero) digits is 15482880, while the sum is 58.

The spelling of 642708818653 in words is "six hundred forty-two billion, seven hundred eight million, eight hundred eighteen thousand, six hundred fifty-three".