1861135943560 has 32 divisors (see below), whose sum is σ = 4266566366040. Its totient is φ = 730408067584.

The previous prime is 1861135943503. The next prime is 1861135943599. The reversal of 1861135943560 is 653495311681.

It can be written as a sum of positive squares in 4 ways, for example, as 1777118283396 + 84017660164 = 1333086^2 + 289858^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1861135943498 and 1861135943507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438945037 + ... + 438949276.

Almost surely, 2^{1861135943560} is an apocalyptic number.

1861135943560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861135943560 is an abundant number, since it is smaller than the sum of its proper divisors (2405430422480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861135943560 is a wasteful number, since it uses less digits than its factorization.

1861135943560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877894377 (or 877894373 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 1861135943560 in words is "one trillion, eight hundred sixty-one billion, one hundred thirty-five million, nine hundred forty-three thousand, five hundred sixty".