78161020305 has 16 divisors (see below), whose sum is σ = 125166311424. Its totient is φ = 41649651200.

The previous prime is 78161020297. The next prime is 78161020339. The reversal of 78161020305 is 50302016187.

It is not a de Polignac number, because 78161020305 - 2³ = 78161020297 is a prime.

It is a super-2 number, since 2×78161020305² (a number of 23 digits) contains 22 as substring.

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, 2246304 + ... + 2280833.

It is an arithmetic number, because the mean of its divisors is an integer number (7822894464).

Almost surely, 2^78161020305 is an apocalyptic number.

It is an amenable number.

78161020305 is a deficient number, since it is larger than the sum of its proper divisors (47005291119).

78161020305 is a wasteful number, since it uses less digits than its factorization.

78161020305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528296.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 78161020305 in words is "seventy-eight billion, one hundred sixty-one million, twenty thousand, three hundred five".