1916806645 has 16 divisors (see below), whose sum is σ = 2544055920. Its totient is φ = 1377229824.

The previous prime is 1916806613. The next prime is 1916806669. The reversal of 1916806645 is 5466086191.

It can be written as a sum of positive squares in 8 ways, for example, as 5280804 + 1911525841 = 2298^2 + 43721^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916806645 - 2⁵ = 1916806613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1916806595 and 1916806604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396100 + ... + 400909.

It is an arithmetic number, because the mean of its divisors is an integer number (159003495).

Almost surely, 2^1916806645 is an apocalyptic number.

It is an amenable number.

1916806645 is a deficient number, since it is larger than the sum of its proper divisors (627249275).

1916806645 is a wasteful number, since it uses less digits than its factorization.

1916806645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797064.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 1916806645 is about 43781.3504245815. The cubic root of 1916806645 is about 1242.2035577566.

The spelling of 1916806645 in words is "one billion, nine hundred sixteen million, eight hundred six thousand, six hundred forty-five".