1851851851871 has 32 divisors (see below), whose sum is σ = 2150615784960. Its totient is φ = 1561872009600.

The previous prime is 1851851851867. The next prime is 1851851851873. The reversal of 1851851851871 is 1781581581581.

It is not a de Polignac number, because 1851851851871 - 2² = 1851851851867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1851851851871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851851851873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80430341 + ... + 80453361.

It is an arithmetic number, because the mean of its divisors is an integer number (67206743280).

Almost surely, 2^{1851851851871} is an apocalyptic number.

1851851851871 is a deficient number, since it is larger than the sum of its proper divisors (298763933089).

1851851851871 is a wasteful number, since it uses less digits than its factorization.

1851851851871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23855.

The product of its digits is 3584000, while the sum is 59.

The spelling of 1851851851871 in words is "one trillion, eight hundred fifty-one billion, eight hundred fifty-one million, eight hundred fifty-one thousand, eight hundred seventy-one".