1985649587573 has 8 divisors (see below), whose sum is σ = 1992059020800. Its totient is φ = 1979245034928.

The previous prime is 1985649587561. The next prime is 1985649587639. The reversal of 1985649587573 is 3757859465891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985649587573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1985649587494 and 1985649587503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985649587533) 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, 404261 + ... + 2033402.

It is an arithmetic number, because the mean of its divisors is an integer number (249007377600).

Almost surely, 2^{1985649587573} is an apocalyptic number.

It is an amenable number.

1985649587573 is a deficient number, since it is larger than the sum of its proper divisors (6409433227).

1985649587573 is a wasteful number, since it uses less digits than its factorization.

1985649587573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440291.

The product of its digits is 2286144000, while the sum is 77.

The spelling of 1985649587573 in words is "one trillion, nine hundred eighty-five billion, six hundred forty-nine million, five hundred eighty-seven thousand, five hundred seventy-three".