7811213687445 has 64 divisors (see below), whose sum is σ = 15140729350656. Its totient is φ = 3356975677440.

The previous prime is 7811213687429. The next prime is 7811213687467. The reversal of 7811213687445 is 5447863121187.

It is not a de Polignac number, because 7811213687445 - 2⁴ = 7811213687429 is a prime.

It is a super-2 number, since 2×7811213687445² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 910974 + ... + 4056143.

It is an arithmetic number, because the mean of its divisors is an integer number (236573896104).

Almost surely, 2^{7811213687445} is an apocalyptic number.

It is an amenable number.

7811213687445 is a deficient number, since it is larger than the sum of its proper divisors (7329515663211).

7811213687445 is a wasteful number, since it uses less digits than its factorization.

7811213687445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4968030.

The product of its digits is 9031680, while the sum is 57.

The spelling of 7811213687445 in words is "seven trillion, eight hundred eleven billion, two hundred thirteen million, six hundred eighty-seven thousand, four hundred forty-five".