1669220571648 has 480 divisors, whose sum is σ = 5330300874624. Its totient is φ = 462498398208.

The previous prime is 1669220571637. The next prime is 1669220571661. The reversal of 1669220571648 is 8461750229661.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1038717661 + ... + 1038719267.

Almost surely, 2^{1669220571648} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669220571648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2665150437312).

1669220571648 is an abundant number, since it is smaller than the sum of its proper divisors (3661080302976).

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

1669220571648 is a wasteful number, since it uses less digits than its factorization.

1669220571648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2029 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 1669220571648 in words is "one trillion, six hundred sixty-nine billion, two hundred twenty million, five hundred seventy-one thousand, six hundred forty-eight".