1665307491696 has 320 divisors, whose sum is σ = 5016928896000. Its totient is φ = 527886222336.

The previous prime is 1665307491691. The next prime is 1665307491707. The reversal of 1665307491696 is 6961947035661.

1665307491696 is a `hidden beast` number, since 1 + 6 + 6 + 53 + 0 + 7 + 491 + 6 + 96 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665307491691) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1952294406 + ... + 1952295258.

It is an arithmetic number, because the mean of its divisors is an integer number (15677902800).

Almost surely, 2^{1665307491696} is an apocalyptic number.

1665307491696 is a gapful number since it is divisible by the number (16) 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 1665307491696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2508464448000).

1665307491696 is an abundant number, since it is smaller than the sum of its proper divisors (3351621404304).

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

1665307491696 is a wasteful number, since it uses less digits than its factorization.

1665307491696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805 (or 1793 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 63.

The spelling of 1665307491696 in words is "one trillion, six hundred sixty-five billion, three hundred seven million, four hundred ninety-one thousand, six hundred ninety-six".