1985309185071 has 16 divisors (see below), whose sum is σ = 2813451280640. Its totient is φ = 1241705894400.

The previous prime is 1985309185061. The next prime is 1985309185099. The reversal of 1985309185071 is 1705819035891.

It is not a de Polignac number, because 1985309185071 - 2²³ = 1985300796463 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985309185061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169071730 + ... + 169083471.

It is an arithmetic number, because the mean of its divisors is an integer number (175840705040).

Almost surely, 2^{1985309185071} is an apocalyptic number.

1985309185071 is a deficient number, since it is larger than the sum of its proper divisors (828142095569).

1985309185071 is a wasteful number, since it uses less digits than its factorization.

1985309185071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338155326.

The product of its (nonzero) digits is 2721600, while the sum is 57.

The spelling of 1985309185071 in words is "one trillion, nine hundred eighty-five billion, three hundred nine million, one hundred eighty-five thousand, seventy-one".