669451384501 has 4 divisors (see below), whose sum is σ = 669453674400. Its totient is φ = 669449094604.

The previous prime is 669451384499. The next prime is 669451384523. The reversal of 669451384501 is 105483154966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669451384501 - 2¹ = 669451384499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669451394501) 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, 628891 + ... + 1316968.

It is an arithmetic number, because the mean of its divisors is an integer number (167363418600).

Almost surely, 2^669451384501 is an apocalyptic number.

It is an amenable number.

669451384501 is a deficient number, since it is larger than the sum of its proper divisors (2289899).

669451384501 is a wasteful number, since it uses less digits than its factorization.

669451384501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289898.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 669451384501 in words is "six hundred sixty-nine billion, four hundred fifty-one million, three hundred eighty-four thousand, five hundred one".