78145808154161 has 24 divisors (see below), whose sum is σ = 87381054391680. Its totient is φ = 69822802153280.

The previous prime is 78145808154133. The next prime is 78145808154179. The reversal of 78145808154161 is 16145180854187.

It is not a de Polignac number, because 78145808154161 - 2²⁶ = 78145741045297 is a prime.

It is a super-2 number, since 2×78145808154161² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78145808154161.

It is not an unprimeable number, because it can be changed into a prime (78145808154181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19927781 + ... + 23524626.

It is an arithmetic number, because the mean of its divisors is an integer number (3640877266320).

Almost surely, 2^{78145808154161} is an apocalyptic number.

It is an amenable number.

78145808154161 is a deficient number, since it is larger than the sum of its proper divisors (9235246237519).

78145808154161 is a wasteful number, since it uses less digits than its factorization.

78145808154161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43452685 (or 43452674 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 59.

The spelling of 78145808154161 in words is "seventy-eight trillion, one hundred forty-five billion, eight hundred eight million, one hundred fifty-four thousand, one hundred sixty-one".