395666640000 has 1280 divisors, whose sum is σ = 1590690816000. Its totient is φ = 96422400000.

The previous prime is 395666639971. The next prime is 395666640041. The reversal of 395666640000 is 46666593.

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

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 159 ways as a sum of consecutive naturals, for example, 1272239845 + ... + 1272240155.

It is an arithmetic number, because the mean of its divisors is an integer number (1242727200).

Almost surely, 2^395666640000 is an apocalyptic number.

395666640000 is a gapful number since it is divisible by the number (30) 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 395666640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795345408000).

395666640000 is an abundant number, since it is smaller than the sum of its proper divisors (1195024176000).

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

395666640000 is a wasteful number, since it uses less digits than its factorization.

395666640000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 395666640000 in words is "three hundred ninety-five billion, six hundred sixty-six million, six hundred forty thousand".