1665499425408 has 2048 divisors, whose sum is σ = 6667960320000. Its totient is φ = 405580234752.

The previous prime is 1665499425407. The next prime is 1665499425461. The reversal of 1665499425408 is 8045249945661.

1665499425408 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 49 + 9 + 42 + 540 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1665499425407) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 13114168641 + ... + 13114168767.

It is an arithmetic number, because the mean of its divisors is an integer number (3255840000).

Almost surely, 2^{1665499425408} is an apocalyptic number.

1665499425408 is a gapful number since it is divisible by the number (18) 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 1665499425408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3333980160000).

1665499425408 is an abundant number, since it is smaller than the sum of its proper divisors (5002460894592).

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

1665499425408 is a wasteful number, since it uses less digits than its factorization.

1665499425408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 63.

The spelling of 1665499425408 in words is "one trillion, six hundred sixty-five billion, four hundred ninety-nine million, four hundred twenty-five thousand, four hundred eight".