1669925421 has 6 divisors (see below), whose sum is σ = 2412114510. Its totient is φ = 1113283608.

The previous prime is 1669925417. The next prime is 1669925437. The reversal of 1669925421 is 1245299661.

1669925421 is a `hidden beast` number, since 16 + 6 + 9 + 92 + 542 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1637092521 + 32832900 = 40461^2 + 5730^2 .

It is not a de Polignac number, because 1669925421 - 2² = 1669925417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669925401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92773626 + ... + 92773643.

It is an arithmetic number, because the mean of its divisors is an integer number (402019085).

Almost surely, 2^1669925421 is an apocalyptic number.

It is an amenable number.

1669925421 is a deficient number, since it is larger than the sum of its proper divisors (742189089).

1669925421 is a wasteful number, since it uses less digits than its factorization.

1669925421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185547275 (or 185547272 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 1669925421 is about 40864.7209827744. The cubic root of 1669925421 is about 1186.4033345096.

The spelling of 1669925421 in words is "one billion, six hundred sixty-nine million, nine hundred twenty-five thousand, four hundred twenty-one".