1810394987445 has 36 divisors (see below), whose sum is σ = 3449226383148. Its totient is φ = 877767264000.

The previous prime is 1810394987419. The next prime is 1810394987459. The reversal of 1810394987445 is 5447894930181.

1810394987445 is a `hidden beast` number, since 1 + 8 + 1 + 0 + 39 + 498 + 74 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 761636707524 + 1048758279921 = 872718^2 + 1024089^2 .

It is not a de Polignac number, because 1810394987445 - 2²⁰ = 1810393938869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 166238356 + ... + 166249245.

Almost surely, 2^{1810394987445} is an apocalyptic number.

1810394987445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1810394987445 is a deficient number, since it is larger than the sum of its proper divisors (1638831395703).

1810394987445 is a wasteful number, since it uses less digits than its factorization.

1810394987445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332487634 (or 332487620 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 63.

The spelling of 1810394987445 in words is "one trillion, eight hundred ten billion, three hundred ninety-four million, nine hundred eighty-seven thousand, four hundred forty-five".