669146256 has 120 divisors (see below), whose sum is σ = 1982760000. Its totient is φ = 210076416.

The previous prime is 669146243. The next prime is 669146273. The reversal of 669146256 is 652641966.

669146256 is a `hidden beast` number, since 6 + 6 + 9 + 14 + 625 + 6 = 666.

It is a super-4 number, since 4×669146256⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 543850 + ... + 545078.

It is an arithmetic number, because the mean of its divisors is an integer number (16523000).

Almost surely, 2^669146256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669146256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991380000).

669146256 is an abundant number, since it is smaller than the sum of its proper divisors (1313613744).

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

669146256 is a wasteful number, since it uses less digits than its factorization.

669146256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461 (or 1452 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 669146256 is about 25867.8614500697. The cubic root of 669146256 is about 874.6621851326.

The spelling of 669146256 in words is "six hundred sixty-nine million, one hundred forty-six thousand, two hundred fifty-six".