1669921875 has 66 divisors (see below), whose sum is σ = 3173828060. Its totient is φ = 843750000.

The previous prime is 1669921873. The next prime is 1669921889. The reversal of 1669921875 is 5781299661.

It is not a de Polignac number, because 1669921875 - 2¹ = 1669921873 is a prime.

Its product of digits (1632960) is a multiple of the sum of its prime divisors (27).

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 65 ways as a sum of consecutive naturals, for example, 87890616 + ... + 87890634.

Almost surely, 2^1669921875 is an apocalyptic number.

1669921875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1669921875 is a deficient number, since it is larger than the sum of its proper divisors (1503906185).

1669921875 is an frugal number, since it uses more digits than its factorization.

1669921875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 27 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1669921875 is about 40864.6775956938. The cubic root of 1669921875 is about 1186.4024947537.

The spelling of 1669921875 in words is "one billion, six hundred sixty-nine million, nine hundred twenty-one thousand, eight hundred seventy-five".