1669418778560 has 896 divisors, whose sum is σ = 4800292761600. Its totient is φ = 547589652480.

The previous prime is 1669418778509. The next prime is 1669418778653. The reversal of 1669418778560 is 658778149661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12010206971 + ... + 12010207109.

It is an arithmetic number, because the mean of its divisors is an integer number (5357469600).

Almost surely, 2^{1669418778560} is an apocalyptic number.

1669418778560 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 1669418778560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2400146380800).

1669418778560 is an abundant number, since it is smaller than the sum of its proper divisors (3130873983040).

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

1669418778560 is a wasteful number, since it uses less digits than its factorization.

1669418778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 68.

The spelling of 1669418778560 in words is "one trillion, six hundred sixty-nine billion, four hundred eighteen million, seven hundred seventy-eight thousand, five hundred sixty".