669998383440 has 160 divisors (see below), whose sum is σ = 2121310477440. Its totient is φ = 174893672448.

The previous prime is 669998383433. The next prime is 669998383459. The reversal of 669998383440 is 44383899966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2016994 + ... + 2325566.

It is an arithmetic number, because the mean of its divisors is an integer number (13258190484).

Almost surely, 2^669998383440 is an apocalyptic number.

669998383440 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 669998383440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060655238720).

669998383440 is an abundant number, since it is smaller than the sum of its proper divisors (1451312094000).

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

669998383440 is a wasteful number, since it uses less digits than its factorization.

669998383440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308781 (or 308775 counting only the distinct ones).

The product of its (nonzero) digits is 241864704, while the sum is 69.

The spelling of 669998383440 in words is "six hundred sixty-nine billion, nine hundred ninety-eight million, three hundred eighty-three thousand, four hundred forty".