1878640303225 has 27 divisors (see below), whose sum is σ = 2709911987661. Its totient is φ = 1288177598400.

The previous prime is 1878640303223. The next prime is 1878640303229. The reversal of 1878640303225 is 5223030468781.

The square root of 1878640303225 is 1370635.

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 66202775401 + 1812437527824 = 257299^2 + 1346268^2 .

It is not a de Polignac number, because 1878640303225 - 2¹ = 1878640303223 is a prime.

It is a super-4 number, since 4×1878640303225⁴ (a number of 50 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1878640303223) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 47952645 + ... + 47991805.

Almost surely, 2^{1878640303225} is an apocalyptic number.

1878640303225 is the 1370635-th square number.

1878640303225 is the 685318-th centered octagonal number.

It is an amenable number.

1878640303225 is a deficient number, since it is larger than the sum of its proper divisors (831271684436).

1878640303225 is an frugal number, since it uses more digits than its factorization.

1878640303225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78346 (or 39173 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

Multiplying 1878640303225 by its sum of digits (49), we get a square (92053374858025 = 9594445²).

1878640303225 divided by its sum of digits (49) gives a square (38339598025 = 195805²).

The spelling of 1878640303225 in words is "one trillion, eight hundred seventy-eight billion, six hundred forty million, three hundred three thousand, two hundred twenty-five".