618686257632 has 96 divisors (see below), whose sum is σ = 1634478652800. Its totient is φ = 204906582528.

The previous prime is 618686257537. The next prime is 618686257639. The reversal of 618686257632 is 236752686816.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618686257639) 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, 21620358 + ... + 21648954.

It is an arithmetic number, because the mean of its divisors is an integer number (17025819300).

Almost surely, 2^618686257632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618686257632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817239326400).

618686257632 is an abundant number, since it is smaller than the sum of its proper divisors (1015792395168).

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

618686257632 is a wasteful number, since it uses less digits than its factorization.

618686257632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30048 (or 30040 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 60.

The spelling of 618686257632 in words is "six hundred eighteen billion, six hundred eighty-six million, two hundred fifty-seven thousand, six hundred thirty-two".