79721308685042 has 8 divisors (see below), whose sum is σ = 119587696511196. Its totient is φ = 39858743181312.

The previous prime is 79721308685023. The next prime is 79721308685069. The reversal of 79721308685042 is 24058680312797.

It is a Cunningham number, because it is equal to 8928679²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 79721308685041 + 1 = 8928679^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955528463 + ... + 955611890.

It is a 2-persistent number, because it is pandigital, and so is 2⋅79721308685042 = 159442617370084, but 3⋅79721308685042 = 239163926055126 is not.

Almost surely, 2^{79721308685042} is an apocalyptic number.

79721308685042 is a deficient number, since it is larger than the sum of its proper divisors (39866387826154).

79721308685042 is a wasteful number, since it uses less digits than its factorization.

79721308685042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911161212.

The product of its (nonzero) digits is 40642560, while the sum is 62.

The spelling of 79721308685042 in words is "seventy-nine trillion, seven hundred twenty-one billion, three hundred eight million, six hundred eighty-five thousand, forty-two".