1851418823605 has 32 divisors (see below), whose sum is σ = 2416128099840. Its totient is φ = 1353761821440.

The previous prime is 1851418823539. The next prime is 1851418823609. The reversal of 1851418823605 is 5063288141581.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1851418823605 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851418823609) 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, 91503840 + ... + 91524070.

It is an arithmetic number, because the mean of its divisors is an integer number (75504003120).

Almost surely, 2^{1851418823605} is an apocalyptic number.

It is an amenable number.

1851418823605 is a deficient number, since it is larger than the sum of its proper divisors (564709276235).

1851418823605 is a wasteful number, since it uses less digits than its factorization.

1851418823605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34021.

The product of its (nonzero) digits is 1843200, while the sum is 52.

The spelling of 1851418823605 in words is "one trillion, eight hundred fifty-one billion, four hundred eighteen million, eight hundred twenty-three thousand, six hundred five".