12505478161 has 8 divisors (see below), whose sum is σ = 13690892448. Its totient is φ = 11328156000.

The previous prime is 12505478149. The next prime is 12505478203. The reversal of 12505478161 is 16187450521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12505478161 - 2⁵ = 12505478129 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12505448161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2019795 + ... + 2025976.

It is an arithmetic number, because the mean of its divisors is an integer number (1711361556).

Almost surely, 2^12505478161 is an apocalyptic number.

12505478161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12505478161 is a deficient number, since it is larger than the sum of its proper divisors (1185414287).

12505478161 is a wasteful number, since it uses less digits than its factorization.

12505478161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4046063.

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 12505478161 in words is "twelve billion, five hundred five million, four hundred seventy-eight thousand, one hundred sixty-one".