669421754 has 8 divisors (see below), whose sum is σ = 1005202548. Its totient is φ = 334354240.

The previous prime is 669421741. The next prime is 669421757. The reversal of 669421754 is 457124966.

It can be written as a sum of positive squares in 2 ways, for example, as 628755625 + 40666129 = 25075^2 + 6377^2 .

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

It is not an unprimeable number, because it can be changed into a prime (669421757) 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, 175967 + ... + 179730.

Almost surely, 2^669421754 is an apocalyptic number.

669421754 is a deficient number, since it is larger than the sum of its proper divisors (335780794).

669421754 is a wasteful number, since it uses less digits than its factorization.

669421754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356640.

The product of its digits is 362880, while the sum is 44.

The square root of 669421754 is about 25873.1860040467. The cubic root of 669421754 is about 874.7822060389.

The spelling of 669421754 in words is "six hundred sixty-nine million, four hundred twenty-one thousand, seven hundred fifty-four".