660962081820 has 96 divisors (see below), whose sum is σ = 1960387688448. Its totient is φ = 165818299392.

The previous prime is 660962081809. The next prime is 660962081821. The reversal of 660962081820 is 28180269066.

It is a happy number.

660962081820 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 660962081820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660962081821) 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, 2294697 + ... + 2566623.

It is an arithmetic number, because the mean of its divisors is an integer number (20420705088).

Almost surely, 2^660962081820 is an apocalyptic number.

660962081820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660962081820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980193844224).

660962081820 is an abundant number, since it is smaller than the sum of its proper divisors (1299425606628).

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

660962081820 is a wasteful number, since it uses less digits than its factorization.

660962081820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274339 (or 274337 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 660962081820 in words is "six hundred sixty billion, nine hundred sixty-two million, eighty-one thousand, eight hundred twenty".