669346542 has 72 divisors (see below), whose sum is σ = 1550168256. Its totient is φ = 208687104.

The previous prime is 669346537. The next prime is 669346547. The reversal of 669346542 is 245643966.

669346542 is a `hidden beast` number, since 6 + 69 + 3 + 46 + 542 = 666.

It is an interprime number because it is at equal distance from previous prime (669346537) and next prime (669346547).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669346547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1159758 + ... + 1160334.

Almost surely, 2^669346542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669346542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775084128).

669346542 is an abundant number, since it is smaller than the sum of its proper divisors (880821714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669346542 is a wasteful number, since it uses less digits than its factorization.

669346542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 822 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 669346542 is about 25871.7324893406. The cubic root of 669346542 is about 874.7494431441.

It can be divided in two parts, 6693 and 46542, that added together give a palindrome (53235).

The spelling of 669346542 in words is "six hundred sixty-nine million, three hundred forty-six thousand, five hundred forty-two".