7984493749891 has 4 divisors (see below), whose sum is σ = 7984504864984. Its totient is φ = 7984482634800.

The previous prime is 7984493749867. The next prime is 7984493749901. The reversal of 7984493749891 is 1989473944897.

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 7984493749891 - 2²³ = 7984485361283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7984493749291) 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, 4399605 + ... + 5943526.

It is an arithmetic number, because the mean of its divisors is an integer number (1996126216246).

Almost surely, 2^{7984493749891} is an apocalyptic number.

7984493749891 is a deficient number, since it is larger than the sum of its proper divisors (11115093).

7984493749891 is a wasteful number, since it uses less digits than its factorization.

7984493749891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11115092.

The product of its digits is 3950456832, while the sum is 82.

The spelling of 7984493749891 in words is "seven trillion, nine hundred eighty-four billion, four hundred ninety-three million, seven hundred forty-nine thousand, eight hundred ninety-one".