7936191938513 has 4 divisors (see below), whose sum is σ = 7936429092660. Its totient is φ = 7935954784368.

The previous prime is 7936191938497. The next prime is 7936191938531. The reversal of 7936191938513 is 3158391916397.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2367757717504 + 5568434221009 = 1538752^2 + 2359753^2 .

It is a cyclic number.

It is not a de Polignac number, because 7936191938513 - 2⁴ = 7936191938497 is a prime.

It is a super-3 number, since 3×7936191938513³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7936191938513.

It is not an unprimeable number, because it can be changed into a prime (7936191938533) 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, 118526870 + ... + 118593807.

It is an arithmetic number, because the mean of its divisors is an integer number (1984107273165).

Almost surely, 2^{7936191938513} is an apocalyptic number.

It is an amenable number.

7936191938513 is a deficient number, since it is larger than the sum of its proper divisors (237154147).

7936191938513 is a wasteful number, since it uses less digits than its factorization.

7936191938513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237154146.

The product of its digits is 33067440, while the sum is 65.

The spelling of 7936191938513 in words is "seven trillion, nine hundred thirty-six billion, one hundred ninety-one million, nine hundred thirty-eight thousand, five hundred thirteen".