7811213687443 has 4 divisors (see below), whose sum is σ = 7815384118408. Its totient is φ = 7807043256480.

The previous prime is 7811213687429. The next prime is 7811213687467. The reversal of 7811213687443 is 3447863121187.

It is a happy number.

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 7811213687443 - 2²⁵ = 7811180133011 is a prime.

It is a super-2 number, since 2×7811213687443² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7811213687483) 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, 2085212673 + ... + 2085216418.

It is an arithmetic number, because the mean of its divisors is an integer number (1953846029602).

Almost surely, 2^{7811213687443} is an apocalyptic number.

7811213687443 is a deficient number, since it is larger than the sum of its proper divisors (4170430965).

7811213687443 is a wasteful number, since it uses less digits than its factorization.

7811213687443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170430964.

The product of its digits is 5419008, while the sum is 55.

The spelling of 7811213687443 in words is "seven trillion, eight hundred eleven billion, two hundred thirteen million, six hundred eighty-seven thousand, four hundred forty-three".