669126242 has 4 divisors (see below), whose sum is σ = 1003689366. Its totient is φ = 334563120.

The previous prime is 669126233. The next prime is 669126277. The reversal of 669126242 is 242621966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242621966 = 2 ⋅121310983.

It can be written as a sum of positive squares in only one way, i.e., 491996761 + 177129481 = 22181^2 + 13309^2 .

It is a junction number, because it is equal to n+sod(n) for n = 669126196 and 669126205.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167281559 + ... + 167281562.

Almost surely, 2^669126242 is an apocalyptic number.

669126242 is a deficient number, since it is larger than the sum of its proper divisors (334563124).

669126242 is a wasteful number, since it uses less digits than its factorization.

669126242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334563123.

The product of its digits is 62208, while the sum is 38.

The square root of 669126242 is about 25867.4745964889. The cubic root of 669126242 is about 874.6534647354.

The spelling of 669126242 in words is "six hundred sixty-nine million, one hundred twenty-six thousand, two hundred forty-two".