669486551 has 4 divisors (see below), whose sum is σ = 669585000. Its totient is φ = 669388104.

The previous prime is 669486539. The next prime is 669486661. The reversal of 669486551 is 155684966.

It is a happy number.

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 669486551 - 2⁶ = 669486487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669486551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669488551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38201 + ... + 52898.

It is an arithmetic number, because the mean of its divisors is an integer number (167396250).

Almost surely, 2^669486551 is an apocalyptic number.

669486551 is a deficient number, since it is larger than the sum of its proper divisors (98449).

669486551 is an equidigital number, since it uses as much as digits as its factorization.

669486551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98448.

The product of its digits is 1555200, while the sum is 50.

The square root of 669486551 is about 25874.4381774755. The cubic root of 669486551 is about 874.8104301161.

The spelling of 669486551 in words is "six hundred sixty-nine million, four hundred eighty-six thousand, five hundred fifty-one".