1878612890625 has 243 divisors, whose sum is σ = 3688944888603. Its totient is φ = 921060000000.

The previous prime is 1878612890603. The next prime is 1878612890629. The reversal of 1878612890625 is 5260982168781.

The square root of 1878612890625 is 1370625.

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

1878612890625 is a `hidden beast` number, since 1 + 8 + 7 + 8 + 612 + 8 + 9 + 0 + 6 + 2 + 5 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 452919578049 + 1425693312576 = 672993^2 + 1194024^2 .

It is not a de Polignac number, because 1878612890625 - 2⁵ = 1878612890593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1878612890629) by changing a digit.

It is a polite number, since it can be written in 242 ways as a sum of consecutive naturals, for example, 43688671854 + ... + 43688671896.

Almost surely, 2^{1878612890625} is an apocalyptic number.

1878612890625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1878612890625 is the 1370625-th square number.

1878612890625 is the 685313-rd centered octagonal number.

It is an amenable number.

1878612890625 is a deficient number, since it is larger than the sum of its proper divisors (1810331997978).

1878612890625 is an frugal number, since it uses more digits than its factorization.

1878612890625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 63.

The spelling of 1878612890625 in words is "one trillion, eight hundred seventy-eight billion, six hundred twelve million, eight hundred ninety thousand, six hundred twenty-five".