66368490240 has 432 divisors, whose sum is σ = 236999347200. Its totient is φ = 15805071360.

The previous prime is 66368490109. The next prime is 66368490269. The reversal of 66368490240 is 4209486366.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 66368490240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20116111 + ... + 20119409.

It is an arithmetic number, because the mean of its divisors is an integer number (548609600).

Almost surely, 2^66368490240 is an apocalyptic number.

66368490240 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 66368490240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118499673600).

66368490240 is an abundant number, since it is smaller than the sum of its proper divisors (170630856960).

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

66368490240 is a wasteful number, since it uses less digits than its factorization.

66368490240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380 (or 3353 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The spelling of 66368490240 in words is "sixty-six billion, three hundred sixty-eight million, four hundred ninety thousand, two hundred forty".