8187810913561 has 8 divisors (see below), whose sum is σ = 8487692853120. Its totient is φ = 7892065276848.

The previous prime is 8187810913511. The next prime is 8187810913589. The reversal of 8187810913561 is 1653190187818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8187810913561 - 2¹⁵ = 8187810880793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8187810913496 and 8187810913505.

It is not an unprimeable number, because it can be changed into a prime (8187810913501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034071681 + ... + 1034079598.

It is an arithmetic number, because the mean of its divisors is an integer number (1060961606640).

Almost surely, 2^{8187810913561} is an apocalyptic number.

It is an amenable number.

8187810913561 is a deficient number, since it is larger than the sum of its proper divisors (299881939559).

8187810913561 is a wasteful number, since it uses less digits than its factorization.

8187810913561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068151423.

The product of its (nonzero) digits is 2903040, while the sum is 58.

The spelling of 8187810913561 in words is "eight trillion, one hundred eighty-seven billion, eight hundred ten million, nine hundred thirteen thousand, five hundred sixty-one".