669965401 has 24 divisors (see below), whose sum is σ = 804142016. Its totient is φ = 546380640.

The previous prime is 669965399. The next prime is 669965419. The reversal of 669965401 is 104569966.

It is not a de Polignac number, because 669965401 - 2¹ = 669965399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669965201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 571546 + ... + 572716.

Almost surely, 2^669965401 is an apocalyptic number.

It is an amenable number.

669965401 is a deficient number, since it is larger than the sum of its proper divisors (134176615).

669965401 is a wasteful number, since it uses less digits than its factorization.

669965401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 669965401 is about 25883.6898644687. The cubic root of 669965401 is about 875.0189496848.

The spelling of 669965401 in words is "six hundred sixty-nine million, nine hundred sixty-five thousand, four hundred one".