1985492355625 has 45 divisors (see below), whose sum is σ = 2503949641347. Its totient is φ = 1573880412000.

The previous prime is 1985492355577. The next prime is 1985492355689. The reversal of 1985492355625 is 5265532945891.

The square root of 1985492355625 is 1409075.

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

It can be written as a sum of positive squares in 7 ways, for example, as 1824976740889 + 160515614736 = 1350917^2 + 400644^2 .

It is not a de Polignac number, because 1985492355625 - 2¹¹ = 1985492353577 is a prime.

It is a super-2 number, since 2×1985492355625² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 5530619196 + ... + 5530619554.

Almost surely, 2^{1985492355625} is an apocalyptic number.

1985492355625 is the 1409075-th square number.

1985492355625 is the 704538-th centered octagonal number.

It is an amenable number.

1985492355625 is a deficient number, since it is larger than the sum of its proper divisors (518457285722).

1985492355625 is an frugal number, since it uses more digits than its factorization.

1985492355625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 521 counting only the distinct ones).

The product of its digits is 116640000, while the sum is 64.

Multiplying 1985492355625 by its sum of digits (64), we get a square (127071510760000 = 11272600²).

The spelling of 1985492355625 in words is "one trillion, nine hundred eighty-five billion, four hundred ninety-two million, three hundred fifty-five thousand, six hundred twenty-five".