1669166521536 has 28 divisors (see below), whose sum is σ = 4416336422072. Its totient is φ = 556388840448.

The previous prime is 1669166521501. The next prime is 1669166521543. The reversal of 1669166521536 is 6351256619661.

It is a super-2 number, since 2×1669166521536² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4346787625 + ... + 4346788008.

Almost surely, 2^{1669166521536} is an apocalyptic number.

1669166521536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1669166521536 is an abundant number, since it is smaller than the sum of its proper divisors (2747169900536).

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

1669166521536 is an equidigital number, since it uses as much as digits as its factorization.

1669166521536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8693575648 (or 8693575638 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 57.

The spelling of 1669166521536 in words is "one trillion, six hundred sixty-nine billion, one hundred sixty-six million, five hundred twenty-one thousand, five hundred thirty-six".