3986778566400 has 432 divisors, whose sum is σ = 15071746846464. Its totient is φ = 909145866240.

The previous prime is 3986778566389. The next prime is 3986778566467. The reversal of 3986778566400 is 46658776893.

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 47 ways as a sum of consecutive naturals, for example, 58160947 + ... + 58229453.

Almost surely, 2^{3986778566400} is an apocalyptic number.

3986778566400 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 3986778566400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7535873423232).

3986778566400 is an abundant number, since it is smaller than the sum of its proper divisors (11084968280064).

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

3986778566400 is a wasteful number, since it uses less digits than its factorization.

3986778566400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68976 (or 68957 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 69.

The spelling of 3986778566400 in words is "three trillion, nine hundred eighty-six billion, seven hundred seventy-eight million, five hundred sixty-six thousand, four hundred".