1669921872 has 80 divisors (see below), whose sum is σ = 4354810560. Its totient is φ = 551402496.

The previous prime is 1669921871. The next prime is 1669921873. The reversal of 1669921872 is 2781299661.

It is an interprime number because it is at equal distance from previous prime (1669921871) and next prime (1669921873).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669921871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3653868 + ... + 3654324.

It is an arithmetic number, because the mean of its divisors is an integer number (54435132).

Almost surely, 2^1669921872 is an apocalyptic number.

1669921872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1669921872 is an abundant number, since it is smaller than the sum of its proper divisors (2684888688).

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

1669921872 is a wasteful number, since it uses less digits than its factorization.

1669921872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1014 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 1669921872 is about 40864.6775589873. The cubic root of 1669921872 is about 1186.4024940432.

The spelling of 1669921872 in words is "one billion, six hundred sixty-nine million, nine hundred twenty-one thousand, eight hundred seventy-two".