1861356180849 has 16 divisors (see below), whose sum is σ = 2770390596864. Its totient is φ = 1101859894800.

The previous prime is 1861356180841. The next prime is 1861356180857. The reversal of 1861356180849 is 9480816531681.

It is an interprime number because it is at equal distance from previous prime (1861356180841) and next prime (1861356180857).

It is not a de Polignac number, because 1861356180849 - 2³ = 1861356180841 is a prime.

It is a super-3 number, since 3×1861356180849³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1861356180792 and 1861356180801.

It is not an unprimeable number, because it can be changed into a prime (1861356180841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655867567 + ... + 655870404.

It is an arithmetic number, because the mean of its divisors is an integer number (173149412304).

Almost surely, 2^{1861356180849} is an apocalyptic number.

It is an amenable number.

1861356180849 is a deficient number, since it is larger than the sum of its proper divisors (909034416015).

1861356180849 is a wasteful number, since it uses less digits than its factorization.

1861356180849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311738028.

The product of its (nonzero) digits is 9953280, while the sum is 60.

The spelling of 1861356180849 in words is "one trillion, eight hundred sixty-one billion, three hundred fifty-six million, one hundred eighty thousand, eight hundred forty-nine".