669711452881 has 3 divisors (see below), whose sum is σ = 669712271241. Its totient is φ = 669710634522.

The previous prime is 669711452833. The next prime is 669711452941. The reversal of 669711452881 is 188254117966.

The square root of 669711452881 is 818359.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 669711452881 - 2²³ = 669703064273 is a prime.

It is a super-2 number, since 2×669711452881² (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 (669711452801) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 409180 + ... + 1227538.

It is an arithmetic number, because the mean of its divisors is an integer number (223237423747).

Almost surely, 2^669711452881 is an apocalyptic number.

669711452881 is the 818359-th square number.

669711452881 is the 409180-th centered octagonal number.

It is an amenable number.

669711452881 is a deficient number, since it is larger than the sum of its proper divisors (818360).

669711452881 is an frugal number, since it uses more digits than its factorization.

669711452881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636718 (or 818359 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 58.

The spelling of 669711452881 in words is "six hundred sixty-nine billion, seven hundred eleven million, four hundred fifty-two thousand, eight hundred eighty-one".