1665423364000 has 192 divisors, whose sum is σ = 4465461716352. Its totient is φ = 605402112000.

The previous prime is 1665423363983. The next prime is 1665423364019. The reversal of 1665423364000 is 4633245661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198567807 + ... + 198576193.

It is an arithmetic number, because the mean of its divisors is an integer number (23257613106).

Almost surely, 2^{1665423364000} is an apocalyptic number.

1665423364000 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 1665423364000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232730858176).

1665423364000 is an abundant number, since it is smaller than the sum of its proper divisors (2800038352352).

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

1665423364000 is a wasteful number, since it uses less digits than its factorization.

1665423364000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12936 (or 12918 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 1665423364000 in words is "one trillion, six hundred sixty-five billion, four hundred twenty-three million, three hundred sixty-four thousand".