669851136 has 180 divisors, whose sum is σ = 2057727672. Its totient is φ = 209731584.

The previous prime is 669851123. The next prime is 669851141. The reversal of 669851136 is 631158966.

It is a junction number, because it is equal to n+sod(n) for n = 669851091 and 669851100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1331461 + ... + 1331963.

Almost surely, 2^669851136 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 669851136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028863836).

669851136 is an abundant number, since it is smaller than the sum of its proper divisors (1387876536).

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

669851136 is a wasteful number, since it uses less digits than its factorization.

669851136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 525 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 669851136 is about 25881.4824923148. The cubic root of 669851136 is about 874.9692009839.

It can be divided in two parts, 66985 and 1136, that added together give a square (68121 = 261²).

The spelling of 669851136 in words is "six hundred sixty-nine million, eight hundred fifty-one thousand, one hundred thirty-six".