79816243501 has 8 divisors (see below), whose sum is σ = 80270780408. Its totient is φ = 79361856000.

The previous prime is 79816243483. The next prime is 79816243531. The reversal of 79816243501 is 10534261897.

It can be written as a sum of positive squares in 4 ways, for example, as 28876204900 + 50940038601 = 169930^2 + 225699^2 .

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

It is a 6-Lehmer number, since φ(79816243501) divides (79816243501-1)⁶.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79816243501 is a prime.

It is a super-2 number, since 2×79816243501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79816243531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1139041 + ... + 1207081.

It is an arithmetic number, because the mean of its divisors is an integer number (10033847551).

It is a 2-persistent number, because it is pandigital, and so is 2⋅79816243501 = 159632487002, but 3⋅79816243501 = 239448730503 is not.

Almost surely, 2^79816243501 is an apocalyptic number.

It is an amenable number.

79816243501 is a deficient number, since it is larger than the sum of its proper divisors (454536907).

79816243501 is a wasteful number, since it uses less digits than its factorization.

79816243501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74703.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 79816243501 in words is "seventy-nine billion, eight hundred sixteen million, two hundred forty-three thousand, five hundred one".