10181781385 has 8 divisors (see below), whose sum is σ = 12229322760. Its totient is φ = 8137968384.

The previous prime is 10181781349. The next prime is 10181781403. The reversal of 10181781385 is 58318718101.

It can be written as a sum of positive squares in 4 ways, for example, as 2671132489 + 7510648896 = 51683^2 + 86664^2 .

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 10181781385 - 2¹⁵ = 10181748617 is a prime.

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, 926080 + ... + 937009.

It is an arithmetic number, because the mean of its divisors is an integer number (1528665345).

Almost surely, 2^10181781385 is an apocalyptic number.

It is an amenable number.

10181781385 is a deficient number, since it is larger than the sum of its proper divisors (2047541375).

10181781385 is a wasteful number, since it uses less digits than its factorization.

10181781385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864187.

The product of its (nonzero) digits is 53760, while the sum is 43.

The spelling of 10181781385 in words is "ten billion, one hundred eighty-one million, seven hundred eighty-one thousand, three hundred eighty-five".