1916728635645 has 48 divisors (see below), whose sum is σ = 3391058623680. Its totient is φ = 1001322592512.

The previous prime is 1916728635617. The next prime is 1916728635677. The reversal of 1916728635645 is 5465368276191.

It is a happy number.

1916728635645 is a `hidden beast` number, since 1 + 9 + 1 + 6 + 7 + 2 + 8 + 63 + 564 + 5 = 666.

It is not a de Polignac number, because 1916728635645 - 2⁷ = 1916728635517 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1807839 + ... + 2664908.

It is an arithmetic number, because the mean of its divisors is an integer number (70647054660).

Almost surely, 2^{1916728635645} is an apocalyptic number.

1916728635645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1916728635645 is a deficient number, since it is larger than the sum of its proper divisors (1474329988035).

1916728635645 is a wasteful number, since it uses less digits than its factorization.

1916728635645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472954 (or 4472951 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 1916728635645 in words is "one trillion, nine hundred sixteen billion, seven hundred twenty-eight million, six hundred thirty-five thousand, six hundred forty-five".