1985963014564 has 27 divisors (see below), whose sum is σ = 3499656930147. Its totient is φ = 986108634048.

The previous prime is 1985963014561. The next prime is 1985963014577. The reversal of 1985963014564 is 4654103695891.

It is a happy number.

The square root of 1985963014564 is 1409242.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1540433464164 + 445529550400 = 1241142^2 + 667480^2 .

It is a super-2 number, since 2×1985963014564² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1985963014561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 419951752 + ... + 419956480.

Almost surely, 2^{1985963014564} is an apocalyptic number.

1985963014564 is the 1409242-nd square number.

It is an amenable number.

1985963014564 is a deficient number, since it is larger than the sum of its proper divisors (1513693915583).

1985963014564 is an frugal number, since it uses more digits than its factorization.

1985963014564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9760 (or 4880 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 61.

The spelling of 1985963014564 in words is "one trillion, nine hundred eighty-five billion, nine hundred sixty-three million, fourteen thousand, five hundred sixty-four".