1810051658361 has 6 divisors (see below), whose sum is σ = 2614519062090. Its totient is φ = 1206701105568.

The previous prime is 1810051658351. The next prime is 1810051658417. The reversal of 1810051658361 is 1638561500181.

It is a happy number.

1810051658361 is a `hidden beast` number, since 1 + 8 + 1 + 0 + 0 + 5 + 1 + 6 + 583 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1405754066025 + 404297592336 = 1185645^2 + 635844^2 .

It is not a de Polignac number, because 1810051658361 - 2¹⁴ = 1810051641977 is a prime.

It is a super-2 number, since 2×1810051658361² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1810051658351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100558425456 + ... + 100558425473.

It is an arithmetic number, because the mean of its divisors is an integer number (435753177015).

Almost surely, 2^{1810051658361} is an apocalyptic number.

It is an amenable number.

1810051658361 is a deficient number, since it is larger than the sum of its proper divisors (804467403729).

1810051658361 is a wasteful number, since it uses less digits than its factorization.

1810051658361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201116850935 (or 201116850932 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 1810051658361 in words is "one trillion, eight hundred ten billion, fifty-one million, six hundred fifty-eight thousand, three hundred sixty-one".