1669606451 has 4 divisors (see below), whose sum is σ = 1708434552. Its totient is φ = 1630778352.

The previous prime is 1669606441. The next prime is 1669606453. The reversal of 1669606451 is 1546069661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1669606451 - 2¹⁴ = 1669590067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669606453) 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 3 ways as a sum of consecutive naturals, for example, 19413986 + ... + 19414071.

It is an arithmetic number, because the mean of its divisors is an integer number (427108638).

Almost surely, 2^1669606451 is an apocalyptic number.

1669606451 is a deficient number, since it is larger than the sum of its proper divisors (38828101).

1669606451 is an equidigital number, since it uses as much as digits as its factorization.

1669606451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38828100.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 1669606451 is about 40860.8180412483. The cubic root of 1669606451 is about 1186.3277919806.

The spelling of 1669606451 in words is "one billion, six hundred sixty-nine million, six hundred six thousand, four hundred fifty-one".