669569481 has 48 divisors (see below), whose sum is σ = 1167254400. Its totient is φ = 361304064.

The previous prime is 669569471. The next prime is 669569503. The reversal of 669569481 is 184965966.

It is a happy number.

It is not a de Polignac number, because 669569481 - 2¹⁵ = 669536713 is a prime.

It is a super-2 number, since 2×669569481² = 896646579773218722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (669569431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 474505 + ... + 475913.

It is an arithmetic number, because the mean of its divisors is an integer number (24317800).

Almost surely, 2^669569481 is an apocalyptic number.

It is an amenable number.

669569481 is a deficient number, since it is larger than the sum of its proper divisors (497684919).

669569481 is a wasteful number, since it uses less digits than its factorization.

669569481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838 (or 1835 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 669569481 is about 25876.0406747246. The cubic root of 669569481 is about 874.8465498527.

It can be divided in two parts, 6695 and 69481, that added together give a square (76176 = 276²).

The spelling of 669569481 in words is "six hundred sixty-nine million, five hundred sixty-nine thousand, four hundred eighty-one".