669892636801 has 4 divisors (see below), whose sum is σ = 669919576900. Its totient is φ = 669865696704.

The previous prime is 669892636793. The next prime is 669892636811. The reversal of 669892636801 is 108636298966.

669892636801 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.

It can be written as a sum of positive squares in 2 ways, for example, as 221347666576 + 448544970225 = 470476^2 + 669735^2 .

It is a cyclic number.

It is not a de Polignac number, because 669892636801 - 2³ = 669892636793 is a prime.

It is a super-2 number, since 2×669892636801² (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 (669892636811) 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, 13432716 + ... + 13482493.

It is an arithmetic number, because the mean of its divisors is an integer number (167479894225).

Almost surely, 2^669892636801 is an apocalyptic number.

It is an amenable number.

669892636801 is a deficient number, since it is larger than the sum of its proper divisors (26940099).

669892636801 is a wasteful number, since it uses less digits than its factorization.

669892636801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26940098.

The product of its (nonzero) digits is 40310784, while the sum is 64.

The spelling of 669892636801 in words is "six hundred sixty-nine billion, eight hundred ninety-two million, six hundred thirty-six thousand, eight hundred one".