669949011396 has 288 divisors, whose sum is σ = 2132829283200. Its totient is φ = 181329757056.

The previous prime is 669949011337. The next prime is 669949011449. The reversal of 669949011396 is 693110949966.

669949011396 is a `hidden beast` number, since 6 + 6 + 9 + 9 + 490 + 1 + 139 + 6 = 666.

669949011396 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 36288600 + ... + 36307056.

Almost surely, 2^669949011396 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 669949011396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066414641600).

669949011396 is an abundant number, since it is smaller than the sum of its proper divisors (1462880271804).

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

669949011396 is a wasteful number, since it uses less digits than its factorization.

669949011396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18541 (or 18488 counting only the distinct ones).

The product of its (nonzero) digits is 17006112, while the sum is 63.

The spelling of 669949011396 in words is "six hundred sixty-nine billion, nine hundred forty-nine million, eleven thousand, three hundred ninety-six".