180399351861 has 24 divisors (see below), whose sum is σ = 272223334656. Its totient is φ = 114984414720.

The previous prime is 180399351841. The next prime is 180399351919. The reversal of 180399351861 is 168153993081.

180399351861 is a `hidden beast` number, since 1 + 8 + 0 + 39 + 93 + 518 + 6 + 1 = 666.

It is not a de Polignac number, because 180399351861 - 2⁷ = 180399351733 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 180399351798 and 180399351807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180399351841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3871980 + ... + 3918293.

It is an arithmetic number, because the mean of its divisors is an integer number (11342638944).

Almost surely, 2^180399351861 is an apocalyptic number.

It is an amenable number.

180399351861 is a deficient number, since it is larger than the sum of its proper divisors (91823982795).

180399351861 is a wasteful number, since it uses less digits than its factorization.

180399351861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790393 (or 7790390 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 180399351861 in words is "one hundred eighty billion, three hundred ninety-nine million, three hundred fifty-one thousand, eight hundred sixty-one".