78258520211 has 4 divisors (see below), whose sum is σ = 81661064592. Its totient is φ = 74855975832.

The previous prime is 78258520189. The next prime is 78258520237. The reversal of 78258520211 is 11202585287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78258520211 - 2⁶ = 78258520147 is a prime.

It is a super-2 number, since 2×78258520211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78258520411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1701272156 + ... + 1701272201.

It is an arithmetic number, because the mean of its divisors is an integer number (20415266148).

Almost surely, 2^78258520211 is an apocalyptic number.

78258520211 is a deficient number, since it is larger than the sum of its proper divisors (3402544381).

78258520211 is a wasteful number, since it uses less digits than its factorization.

78258520211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402544380.

The product of its (nonzero) digits is 89600, while the sum is 41.

The spelling of 78258520211 in words is "seventy-eight billion, two hundred fifty-eight million, five hundred twenty thousand, two hundred eleven".