7811213687442 has 96 divisors (see below), whose sum is σ = 19147686876864. Its totient is φ = 2366909812800.

The previous prime is 7811213687429. The next prime is 7811213687467. The reversal of 7811213687442 is 2447863121187.

7811213687442 is a `hidden beast` number, since 7 + 8 + 112 + 1 + 3 + 6 + 87 + 442 = 666.

It is a super-2 number, since 2×7811213687442² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 182496388 + ... + 182539184.

It is an arithmetic number, because the mean of its divisors is an integer number (199455071634).

Almost surely, 2^{7811213687442} is an apocalyptic number.

7811213687442 is an abundant number, since it is smaller than the sum of its proper divisors (11336473189422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7811213687442 is a wasteful number, since it uses less digits than its factorization.

7811213687442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76966 (or 76954 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 7811213687442 in words is "seven trillion, eight hundred eleven billion, two hundred thirteen million, six hundred eighty-seven thousand, four hundred forty-two".