669471660 has 288 divisors, whose sum is σ = 2465648640. Its totient is φ = 144806400.

The previous prime is 669471589. The next prime is 669471661. The reversal of 669471660 is 66174966.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (669471661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 797521 + ... + 798359.

It is an arithmetic number, because the mean of its divisors is an integer number (8561280).

Almost surely, 2^669471660 is an apocalyptic number.

669471660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669471660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1232824320).

669471660 is an abundant number, since it is smaller than the sum of its proper divisors (1796176980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669471660 is a wasteful number, since it uses less digits than its factorization.

669471660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 669471660 is about 25874.1504208351. The cubic root of 669471660 is about 874.8039441014.

The spelling of 669471660 in words is "six hundred sixty-nine million, four hundred seventy-one thousand, six hundred sixty".