79991544542 has 16 divisors (see below), whose sum is σ = 147676697952. Its totient is φ = 31645006560.

The previous prime is 79991544533. The next prime is 79991544547. The reversal of 79991544542 is 24544519997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79991544547) 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 7 ways as a sum of consecutive naturals, for example, 219756809 + ... + 219757172.

It is an arithmetic number, because the mean of its divisors is an integer number (9229793622).

Almost surely, 2^79991544542 is an apocalyptic number.

79991544542 is a deficient number, since it is larger than the sum of its proper divisors (67685153410).

79991544542 is a wasteful number, since it uses less digits than its factorization.

79991544542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439514003.

The product of its digits is 16329600, while the sum is 59.

The spelling of 79991544542 in words is "seventy-nine billion, nine hundred ninety-one million, five hundred forty-four thousand, five hundred forty-two".