20192755513225 has 9 divisors (see below), whose sum is σ = 25039044696967. Its totient is φ = 16154186436040.

The previous prime is 20192755513211. The next prime is 20192755513237. The reversal of 20192755513225 is 52231555729102.

The square root of 20192755513225 is 4493635.

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

It can be written as a sum of positive squares in only one way, i.e., 7269391984761 + 12923363528464 = 2696181^2 + 3594908^2 .

It is not a de Polignac number, because 20192755513225 - 2¹¹ = 20192755511177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22018812 + ... + 22917538.

Almost surely, 2^{20192755513225} is an apocalyptic number.

20192755513225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20192755513225 is the 4493635-th square number.

20192755513225 is the 2246818-th centered octagonal number.

It is an amenable number.

20192755513225 is a deficient number, since it is larger than the sum of its proper divisors (4846289183742).

20192755513225 is an frugal number, since it uses more digits than its factorization.

20192755513225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797464 (or 898732 counting only the distinct ones).

The product of its (nonzero) digits is 1890000, while the sum is 49.

Multiplying 20192755513225 by its sum of digits (49), we get a square (989445020148025 = 31455445²).

The spelling of 20192755513225 in words is "twenty trillion, one hundred ninety-two billion, seven hundred fifty-five million, five hundred thirteen thousand, two hundred twenty-five".