19646484125 has 8 divisors (see below), whose sum is σ = 24518812344. Its totient is φ = 15717187200.

The previous prime is 19646484119. The next prime is 19646484127. The reversal of 19646484125 is 52148464691.

It can be written as a sum of positive squares in 4 ways, for example, as 5535657604 + 14110826521 = 74402^2 + 118789^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19646484125 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19646484127) 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, 78585812 + ... + 78586061.

It is an arithmetic number, because the mean of its divisors is an integer number (3064851543).

Almost surely, 2^19646484125 is an apocalyptic number.

It is an amenable number.

19646484125 is a deficient number, since it is larger than the sum of its proper divisors (4872328219).

19646484125 is an equidigital number, since it uses as much as digits as its factorization.

19646484125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157171888 (or 157171878 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The spelling of 19646484125 in words is "nineteen billion, six hundred forty-six million, four hundred eighty-four thousand, one hundred twenty-five".