1660503134400 has 504 divisors, whose sum is σ = 5996423912640. Its totient is φ = 401987942400.

The previous prime is 1660503134377. The next prime is 1660503134401. The reversal of 1660503134400 is 44313050661.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1660503134401) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 550016091 + ... + 550019109.

Almost surely, 2^{1660503134400} is an apocalyptic number.

1660503134400 is a gapful number since it is divisible by the number (10) 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 1660503134400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2998211956320).

1660503134400 is an abundant number, since it is smaller than the sum of its proper divisors (4335920778240).

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

1660503134400 is a wasteful number, since it uses less digits than its factorization.

1660503134400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013 (or 3987 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 1660503134400 in words is "one trillion, six hundred sixty billion, five hundred three million, one hundred thirty-four thousand, four hundred".