1771985853 has 12 divisors (see below), whose sum is σ = 2792220288. Its totient is φ = 1073930760.

The previous prime is 1771985851. The next prime is 1771985863. The reversal of 1771985853 is 3585891771.

It is a happy number.

It is not a de Polignac number, because 1771985853 - 2¹ = 1771985851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1771985853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1771985851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8949325 + ... + 8949522.

It is an arithmetic number, because the mean of its divisors is an integer number (232685024).

Almost surely, 2^1771985853 is an apocalyptic number.

It is an amenable number.

1771985853 is a deficient number, since it is larger than the sum of its proper divisors (1020234435).

1771985853 is a wasteful number, since it uses less digits than its factorization.

1771985853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17898864 (or 17898861 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 54.

The square root of 1771985853 is about 42094.9623232994. The cubic root of 1771985853 is about 1210.0967190406.

The spelling of 1771985853 in words is "one billion, seven hundred seventy-one million, nine hundred eighty-five thousand, eight hundred fifty-three".