1851685001851 has 4 divisors (see below), whose sum is σ = 1872490451400. Its totient is φ = 1830879552304.

The previous prime is 1851685001741. The next prime is 1851685001861. The reversal of 1851685001851 is 1581005861581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1851685001851 - 2⁹ = 1851685001339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1851685001795 and 1851685001804.

It is not an unprimeable number, because it can be changed into a prime (1851685001861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10402724641 + ... + 10402724818.

It is an arithmetic number, because the mean of its divisors is an integer number (468122612850).

Almost surely, 2^{1851685001851} is an apocalyptic number.

1851685001851 is a deficient number, since it is larger than the sum of its proper divisors (20805449549).

1851685001851 is an equidigital number, since it uses as much as digits as its factorization.

1851685001851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805449548.

The product of its (nonzero) digits is 384000, while the sum is 49.

The spelling of 1851685001851 in words is "one trillion, eight hundred fifty-one billion, six hundred eighty-five million, one thousand, eight hundred fifty-one".