1669715663616 has 1728 divisors, whose sum is σ = 7035129593856. Its totient is φ = 366280704000.

The previous prime is 1669715663591. The next prime is 1669715663621. The reversal of 1669715663616 is 6163665179661.

It is a happy number.

1669715663616 is a `hidden beast` number, since 1 + 6 + 6 + 9 + 7 + 1 + 5 + 6 + 6 + 3 + 616 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1450664641 + ... + 1450665791.

It is an arithmetic number, because the mean of its divisors is an integer number (4071255552).

Almost surely, 2^{1669715663616} is an apocalyptic number.

1669715663616 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 1669715663616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3517564796928).

1669715663616 is an abundant number, since it is smaller than the sum of its proper divisors (5365413930240).

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

1669715663616 is a wasteful number, since it uses less digits than its factorization.

1669715663616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258 (or 1241 counting only the distinct ones).

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

The spelling of 1669715663616 in words is "one trillion, six hundred sixty-nine billion, seven hundred fifteen million, six hundred sixty-three thousand, six hundred sixteen".