8420645858743 has 4 divisors (see below), whose sum is σ = 8421064462440. Its totient is φ = 8420227255048.

The previous prime is 8420645858731. The next prime is 8420645858759. The reversal of 8420645858743 is 3478585460248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8420645858743 - 2⁵ = 8420645858711 is a prime.

It is a super-3 number, since 3×8420645858743³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420645958743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209271673 + ... + 209311906.

It is an arithmetic number, because the mean of its divisors is an integer number (2105266115610).

Almost surely, 2^{8420645858743} is an apocalyptic number.

8420645858743 is a deficient number, since it is larger than the sum of its proper divisors (418603697).

8420645858743 is a wasteful number, since it uses less digits than its factorization.

8420645858743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418603696.

The product of its (nonzero) digits is 206438400, while the sum is 64.

The spelling of 8420645858743 in words is "eight trillion, four hundred twenty billion, six hundred forty-five million, eight hundred fifty-eight thousand, seven hundred forty-three".