1628666497 has 8 divisors (see below), whose sum is σ = 1639901600. Its totient is φ = 1617446880.

The previous prime is 1628666489. The next prime is 1628666531. The reversal of 1628666497 is 7946668261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1628666497 - 2³ = 1628666489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628666597) 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 7 ways as a sum of consecutive naturals, for example, 273997 + ... + 279877.

It is an arithmetic number, because the mean of its divisors is an integer number (204987700).

Almost surely, 2^1628666497 is an apocalyptic number.

It is an amenable number.

1628666497 is a deficient number, since it is larger than the sum of its proper divisors (11235103).

1628666497 is a wasteful number, since it uses less digits than its factorization.

1628666497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7743.

The product of its digits is 5225472, while the sum is 55.

The square root of 1628666497 is about 40356.7404159454. The cubic root of 1628666497 is about 1176.5509013682.

The spelling of 1628666497 in words is "one billion, six hundred twenty-eight million, six hundred sixty-six thousand, four hundred ninety-seven".