1851687878156 has 12 divisors (see below), whose sum is σ = 3284843565192. Its totient is φ = 913161145248.

The previous prime is 1851687878123. The next prime is 1851687878177. The reversal of 1851687878156 is 6518787861581.

It is a self number, because there is not a number n which added to its sum of digits gives 1851687878156.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3170698130 + ... + 3170698713.

It is an arithmetic number, because the mean of its divisors is an integer number (273736963766).

Almost surely, 2^{1851687878156} is an apocalyptic number.

It is an amenable number.

1851687878156 is a deficient number, since it is larger than the sum of its proper divisors (1433155687036).

1851687878156 is a wasteful number, since it uses less digits than its factorization.

1851687878156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341396920 (or 6341396918 counting only the distinct ones).

The product of its digits is 180633600, while the sum is 71.

The spelling of 1851687878156 in words is "one trillion, eight hundred fifty-one billion, six hundred eighty-seven million, eight hundred seventy-eight thousand, one hundred fifty-six".