669276521 has 8 divisors (see below), whose sum is σ = 676922400. Its totient is φ = 661671360.

The previous prime is 669276499. The next prime is 669276551. The reversal of 669276521 is 125672966.

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 669276521 - 2⁶ = 669276457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (669276551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23510 + ... + 43488.

It is an arithmetic number, because the mean of its divisors is an integer number (84615300).

Almost surely, 2^669276521 is an apocalyptic number.

It is an amenable number.

669276521 is a deficient number, since it is larger than the sum of its proper divisors (7645879).

669276521 is a wasteful number, since it uses less digits than its factorization.

669276521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20359.

The product of its digits is 272160, while the sum is 44.

The square root of 669276521 is about 25870.3792202588. The cubic root of 669276521 is about 874.7189392805.

The spelling of 669276521 in words is "six hundred sixty-nine million, two hundred seventy-six thousand, five hundred twenty-one".