1807145021645 has 8 divisors (see below), whose sum is σ = 2221466075640. Its totient is φ = 1410454650880.

The previous prime is 1807145021629. The next prime is 1807145021653. The reversal of 1807145021645 is 5461205417081.

It can be written as a sum of positive squares in 4 ways, for example, as 103396974916 + 1703748046729 = 321554^2 + 1305277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1807145021645 - 2⁴ = 1807145021629 is a prime.

It is a super-3 number, since 3×1807145021645³ (a number of 38 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1807145021596 and 1807145021605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4407670580 + ... + 4407670989.

It is an arithmetic number, because the mean of its divisors is an integer number (277683259455).

Almost surely, 2^{1807145021645} is an apocalyptic number.

It is an amenable number.

1807145021645 is a deficient number, since it is larger than the sum of its proper divisors (414321053995).

1807145021645 is an equidigital number, since it uses as much as digits as its factorization.

1807145021645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8815341615.

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 1807145021645 in words is "one trillion, eight hundred seven billion, one hundred forty-five million, twenty-one thousand, six hundred forty-five".