1851049516861 has 8 divisors (see below), whose sum is σ = 1864487612960. Its totient is φ = 1837613152368.

The previous prime is 1851049516859. The next prime is 1851049516873. The reversal of 1851049516861 is 1686159401581.

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 1851049516861 - 2¹ = 1851049516859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851049516061) 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, 1752715 + ... + 2602711.

It is an arithmetic number, because the mean of its divisors is an integer number (233060951620).

Almost surely, 2^{1851049516861} is an apocalyptic number.

It is an amenable number.

1851049516861 is a deficient number, since it is larger than the sum of its proper divisors (13438096099).

1851049516861 is a wasteful number, since it uses less digits than its factorization.

1851049516861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865803.

The product of its (nonzero) digits is 2073600, while the sum is 55.

The spelling of 1851049516861 in words is "one trillion, eight hundred fifty-one billion, forty-nine million, five hundred sixteen thousand, eight hundred sixty-one".