669818572001 has 4 divisors (see below), whose sum is σ = 671182765104. Its totient is φ = 668454378900.

The previous prime is 669818571997. The next prime is 669818572037. The reversal of 669818572001 is 100275818966.

669818572001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100275818966 = 2 ⋅50137909483.

It is a cyclic number.

It is not a de Polignac number, because 669818572001 - 2² = 669818571997 is a prime.

It is a super-2 number, since 2×669818572001² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669818572091) 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, 682095815 + ... + 682096796.

It is an arithmetic number, because the mean of its divisors is an integer number (167795691276).

Almost surely, 2^669818572001 is an apocalyptic number.

It is an amenable number.

669818572001 is a deficient number, since it is larger than the sum of its proper divisors (1364193103).

669818572001 is a wasteful number, since it uses less digits than its factorization.

669818572001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364193102.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 669818572001 in words is "six hundred sixty-nine billion, eight hundred eighteen million, five hundred seventy-two thousand, one".