7478403643681 has 4 divisors (see below), whose sum is σ = 7478712961200. Its totient is φ = 7478094326164.

The previous prime is 7478403643663. The next prime is 7478403643693. The reversal of 7478403643681 is 1863463048747.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7478403643681 - 2³⁷ = 7340964690209 is a prime.

It is a super-2 number, since 2×7478403643681² (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 (7478403643621) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 154622491 + ... + 154670848.

It is an arithmetic number, because the mean of its divisors is an integer number (1869678240300).

Almost surely, 2^{7478403643681} is an apocalyptic number.

It is an amenable number.

7478403643681 is a deficient number, since it is larger than the sum of its proper divisors (309317519).

7478403643681 is a wasteful number, since it uses less digits than its factorization.

7478403643681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309317518.

The product of its (nonzero) digits is 65028096, while the sum is 61.

The spelling of 7478403643681 in words is "seven trillion, four hundred seventy-eight billion, four hundred three million, six hundred forty-three thousand, six hundred eighty-one".