8645553642 has 64 divisors (see below), whose sum is σ = 19511331840. Its totient is φ = 2531068800.

The previous prime is 8645553619. The next prime is 8645553649. The reversal of 8645553642 is 2463555468.

It is a junction number, because it is equal to n+sod(n) for n = 8645553591 and 8645553600.

It is not an unprimeable number, because it can be changed into a prime (8645553649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263209 + ... + 294227.

It is an arithmetic number, because the mean of its divisors is an integer number (304864560).

Almost surely, 2^8645553642 is an apocalyptic number.

8645553642 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 8645553642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9755665920).

8645553642 is an abundant number, since it is smaller than the sum of its proper divisors (10865778198).

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

8645553642 is a wasteful number, since it uses less digits than its factorization.

8645553642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31179.

The product of its digits is 3456000, while the sum is 48.

The square root of 8645553642 is about 92981.4693473920. The cubic root of 8645553642 is about 2052.4106989849.

The spelling of 8645553642 in words is "eight billion, six hundred forty-five million, five hundred fifty-three thousand, six hundred forty-two".