78186734820458 has 32 divisors (see below), whose sum is σ = 130165784663040. Its totient is φ = 34922199910000.

The previous prime is 78186734820377. The next prime is 78186734820521. The reversal of 78186734820458 is 85402843768187.

It is a super-2 number, since 2×78186734820458² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78186734820391 and 78186734820400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9759188 + ... + 15862383.

It is an arithmetic number, because the mean of its divisors is an integer number (4067680770720).

Almost surely, 2^{78186734820458} is an apocalyptic number.

78186734820458 is a deficient number, since it is larger than the sum of its proper divisors (51979049842582).

78186734820458 is a wasteful number, since it uses less digits than its factorization.

78186734820458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25623994.

The product of its (nonzero) digits is 578027520, while the sum is 71.

The spelling of 78186734820458 in words is "seventy-eight trillion, one hundred eighty-six billion, seven hundred thirty-four million, eight hundred twenty thousand, four hundred fifty-eight".