78055561005 has 16 divisors (see below), whose sum is σ = 124904989440. Its totient is φ = 41624268608.

The previous prime is 78055560997. The next prime is 78055561027. The reversal of 78055561005 is 50016555087.

It is a cyclic number.

It is not a de Polignac number, because 78055561005 - 2³ = 78055560997 is a prime.

It is a super-2 number, since 2×78055561005² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 213525 + ... + 449114.

It is an arithmetic number, because the mean of its divisors is an integer number (7806561840).

Almost surely, 2^78055561005 is an apocalyptic number.

It is an amenable number.

78055561005 is a deficient number, since it is larger than the sum of its proper divisors (46849428435).

78055561005 is a wasteful number, since it uses less digits than its factorization.

78055561005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670500.

The product of its (nonzero) digits is 210000, while the sum is 42.

The spelling of 78055561005 in words is "seventy-eight billion, fifty-five million, five hundred sixty-one thousand, five".