3999799838016 has 84 divisors (see below), whose sum is σ = 11681019309492. Its totient is φ = 1308110628864.

The previous prime is 3999799837991. The next prime is 3999799838029. The reversal of 3999799838016 is 6108389979993.

It is a happy number.

3999799838016 is a `hidden beast` number, since 399 + 9 + 79 + 9 + 83 + 80 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1955746310400 + 2044053527616 = 1398480^2 + 1429704^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65479821 + ... + 65540876.

Almost surely, 2^{3999799838016} is an apocalyptic number.

3999799838016 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3999799838016 is an abundant number, since it is smaller than the sum of its proper divisors (7681219471476).

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

3999799838016 is a wasteful number, since it uses less digits than its factorization.

3999799838016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131020768 (or 131020755 counting only the distinct ones).

The product of its (nonzero) digits is 1428513408, while the sum is 81.

The spelling of 3999799838016 in words is "three trillion, nine hundred ninety-nine billion, seven hundred ninety-nine million, eight hundred thirty-eight thousand, sixteen".