669962281 has 4 divisors (see below), whose sum is σ = 671509972. Its totient is φ = 668414592.

The previous prime is 669962257. The next prime is 669962291. The reversal of 669962281 is 182269966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182269966 = 2 ⋅91134983.

It can be written as a sum of positive squares in 2 ways, for example, as 111112681 + 558849600 = 10541^2 + 23640^2 .

It is a cyclic number.

It is not a de Polignac number, because 669962281 - 2¹⁷ = 669831209 is a prime.

It is a super-2 number, since 2×669962281² = 897698915925445922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669962291) 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, 773196 + ... + 774061.

It is an arithmetic number, because the mean of its divisors is an integer number (167877493).

Almost surely, 2^669962281 is an apocalyptic number.

It is an amenable number.

669962281 is a deficient number, since it is larger than the sum of its proper divisors (1547691).

669962281 is a wasteful number, since it uses less digits than its factorization.

669962281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547690.

The product of its digits is 559872, while the sum is 49.

The square root of 669962281 is about 25883.6295947844. The cubic root of 669962281 is about 875.0175913742.

The spelling of 669962281 in words is "six hundred sixty-nine million, nine hundred sixty-two thousand, two hundred eighty-one".