1878048235561 has 9 divisors (see below), whose sum is σ = 1882635223543. Its totient is φ = 1873472406520.

The previous prime is 1878048235541. The next prime is 1878048235597. The reversal of 1878048235561 is 1655328408781.

The square root of 1878048235561 is 1370419.

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., 1049766225561 + 828282010000 = 1024581^2 + 910100^2 .

It is not a de Polignac number, because 1878048235561 - 2²⁹ = 1877511364649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1878048235496 and 1878048235505.

It is not an unprimeable number, because it can be changed into a prime (1878048235541) 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, 656429271 + ... + 656432131.

Almost surely, 2^{1878048235561} is an apocalyptic number.

1878048235561 is the 1370419-th square number.

1878048235561 is the 685210-th centered octagonal number.

It is an amenable number.

1878048235561 is a deficient number, since it is larger than the sum of its proper divisors (4586987982).

1878048235561 is an frugal number, since it uses more digits than its factorization.

1878048235561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6680 (or 3340 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 1878048235561 in words is "one trillion, eight hundred seventy-eight billion, forty-eight million, two hundred thirty-five thousand, five hundred sixty-one".