642708818652 has 48 divisors (see below), whose sum is σ = 1560458898432. Its totient is φ = 205721855040.

The previous prime is 642708818627. The next prime is 642708818657. The reversal of 642708818652 is 256818807246.

642708818652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 642708818592 and 642708818601.

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, 10720624 + ... + 10780407.

It is an arithmetic number, because the mean of its divisors is an integer number (32509560384).

Almost surely, 2^642708818652 is an apocalyptic number.

It is an amenable number.

642708818652 is an abundant number, since it is smaller than the sum of its proper divisors (917750079780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642708818652 is a wasteful number, since it uses less digits than its factorization.

642708818652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21501138 (or 21501136 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 57.

The spelling of 642708818652 in words is "six hundred forty-two billion, seven hundred eight million, eight hundred eighteen thousand, six hundred fifty-two".