2046978991899 has 20 divisors (see below), whose sum is σ = 3065309228520. Its totient is φ = 1361316080160.

The previous prime is 2046978991877. The next prime is 2046978991913. The reversal of 2046978991899 is 9981998796402.

2046978991899 is a `hidden beast` number, since 2 + 0 + 469 + 78 + 9 + 9 + 1 + 89 + 9 = 666.

It is not a de Polignac number, because 2046978991899 - 2⁵ = 2046978991867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (2046978991859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30860937 + ... + 30927194.

It is an arithmetic number, because the mean of its divisors is an integer number (153265461426).

Almost surely, 2^{2046978991899} is an apocalyptic number.

2046978991899 is a deficient number, since it is larger than the sum of its proper divisors (1018330236621).

2046978991899 is an equidigital number, since it uses as much as digits as its factorization.

2046978991899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61788552 (or 61788543 counting only the distinct ones).

The product of its (nonzero) digits is 1269789696, while the sum is 81.

The spelling of 2046978991899 in words is "two trillion, forty-six billion, nine hundred seventy-eight million, nine hundred ninety-one thousand, eight hundred ninety-nine".