78805505501 has 8 divisors (see below), whose sum is σ = 81220592640. Its totient is φ = 76421184048.

The previous prime is 78805505489. The next prime is 78805505509. The reversal of 78805505501 is 10550550887.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78805505501 is a prime.

It is a super-2 number, since 2×78805505501² (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 (78805505509) 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, 7686221 + ... + 7696466.

It is an arithmetic number, because the mean of its divisors is an integer number (10152574080).

Almost surely, 2^78805505501 is an apocalyptic number.

It is an amenable number.

78805505501 is a deficient number, since it is larger than the sum of its proper divisors (2415087139).

78805505501 is a wasteful number, since it uses less digits than its factorization.

78805505501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15382843.

The product of its (nonzero) digits is 280000, while the sum is 44.

The spelling of 78805505501 in words is "seventy-eight billion, eight hundred five million, five hundred five thousand, five hundred one".