10861195815 has 144 divisors (see below), whose sum is σ = 21268578240. Its totient is φ = 5113912320.

The previous prime is 10861195783. The next prime is 10861195817. The reversal of 10861195815 is 51859116801.

10861195815 is a `hidden beast` number, since 1 + 0 + 8 + 61 + 1 + 9 + 581 + 5 = 666.

It is not a de Polignac number, because 10861195815 - 2⁵ = 10861195783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10861195817) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 15318681 + ... + 15319389.

It is an arithmetic number, because the mean of its divisors is an integer number (147698460).

Almost surely, 2^10861195815 is an apocalyptic number.

10861195815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

10861195815 is a deficient number, since it is larger than the sum of its proper divisors (10407382425).

10861195815 is a wasteful number, since it uses less digits than its factorization.

10861195815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 45.

The spelling of 10861195815 in words is "ten billion, eight hundred sixty-one million, one hundred ninety-five thousand, eight hundred fifteen".