1861405459873 has 8 divisors (see below), whose sum is σ = 1880738256992. Its totient is φ = 1842075582336.

The previous prime is 1861405459871. The next prime is 1861405459937. The reversal of 1861405459873 is 3789545041681.

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 1861405459873 - 2¹ = 1861405459871 is a prime.

It is a super-2 number, since 2×1861405459873² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861405459871) 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, 563686 + ... + 2010112.

It is an arithmetic number, because the mean of its divisors is an integer number (235092282124).

Almost surely, 2^{1861405459873} is an apocalyptic number.

It is an amenable number.

1861405459873 is a deficient number, since it is larger than the sum of its proper divisors (19332797119).

1861405459873 is a wasteful number, since it uses less digits than its factorization.

1861405459873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459791.

The product of its (nonzero) digits is 29030400, while the sum is 61.

The spelling of 1861405459873 in words is "one trillion, eight hundred sixty-one billion, four hundred five million, four hundred fifty-nine thousand, eight hundred seventy-three".