1821511830745 has 8 divisors (see below), whose sum is σ = 2186178110784. Its totient is φ = 1456966855344.

The previous prime is 1821511830739. The next prime is 1821511830779. The reversal of 1821511830745 is 5470381151281.

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

It is a cyclic number.

It is not a de Polignac number, because 1821511830745 - 2²³ = 1821503442137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1821511830695 and 1821511830704.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30293119 + ... + 30353188.

It is an arithmetic number, because the mean of its divisors is an integer number (273272263848).

Almost surely, 2^{1821511830745} is an apocalyptic number.

It is an amenable number.

1821511830745 is a deficient number, since it is larger than the sum of its proper divisors (364666280039).

1821511830745 is an equidigital number, since it uses as much as digits as its factorization.

1821511830745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60652319.

The product of its (nonzero) digits is 268800, while the sum is 46.

The spelling of 1821511830745 in words is "one trillion, eight hundred twenty-one billion, five hundred eleven million, eight hundred thirty thousand, seven hundred forty-five".