78212192805155 has 32 divisors (see below), whose sum is σ = 97246598500800. Its totient is φ = 60315419469312.

The previous prime is 78212192805143. The next prime is 78212192805181. The reversal of 78212192805155 is 55150829121287.

It is a cyclic number.

It is not a de Polignac number, because 78212192805155 - 2⁸ = 78212192804899 is a prime.

It is a super-2 number, since 2×78212192805155² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78212192805155.

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 31 ways as a sum of consecutive naturals, for example, 290153981 + ... + 290423409.

It is an arithmetic number, because the mean of its divisors is an integer number (3038956203150).

Almost surely, 2^{78212192805155} is an apocalyptic number.

78212192805155 is a deficient number, since it is larger than the sum of its proper divisors (19034405695645).

78212192805155 is a wasteful number, since it uses less digits than its factorization.

78212192805155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272663.

The product of its (nonzero) digits is 4032000, while the sum is 56.

The spelling of 78212192805155 in words is "seventy-eight trillion, two hundred twelve billion, one hundred ninety-two million, eight hundred five thousand, one hundred fifty-five".