2146445405778 has 16 divisors (see below), whose sum is σ = 4408914888000. Its totient is φ = 696144455856.

The previous prime is 2146445405777. The next prime is 2146445405791. The reversal of 2146445405778 is 8775045446412.

It is not an unprimeable number, because it can be changed into a prime (2146445405771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4834336278 + ... + 4834336721.

It is an arithmetic number, because the mean of its divisors is an integer number (275557180500).

Almost surely, 2^{2146445405778} is an apocalyptic number.

2146445405778 is an abundant number, since it is smaller than the sum of its proper divisors (2262469482222).

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

2146445405778 is a wasteful number, since it uses less digits than its factorization.

2146445405778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9668673041.

The product of its (nonzero) digits is 30105600, while the sum is 57.

The spelling of 2146445405778 in words is "two trillion, one hundred forty-six billion, four hundred forty-five million, four hundred five thousand, seven hundred seventy-eight".