1810399951872 has 264 divisors, whose sum is σ = 5540715481392. Its totient is φ = 567381196800.

The previous prime is 1810399951853. The next prime is 1810399951951. The reversal of 1810399951872 is 2781599930181.

1810399951872 is a `hidden beast` number, since 1 + 8 + 10 + 39 + 9 + 9 + 518 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166223547 + ... + 166234437.

Almost surely, 2^{1810399951872} is an apocalyptic number.

1810399951872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1810399951872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2770357740696).

1810399951872 is an abundant number, since it is smaller than the sum of its proper divisors (3730315529520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1810399951872 is a wasteful number, since it uses less digits than its factorization.

1810399951872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11995 (or 11974 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 63.

The spelling of 1810399951872 in words is "one trillion, eight hundred ten billion, three hundred ninety-nine million, nine hundred fifty-one thousand, eight hundred seventy-two".