19825319412 has 18 divisors (see below), whose sum is σ = 50114001938. Its totient is φ = 6608439792.

The previous prime is 19825319411. The next prime is 19825319419. The reversal of 19825319412 is 21491352891.

19825319412 is a `hidden beast` number, since 19 + 8 + 2 + 531 + 94 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10153383696 + 9671935716 = 100764^2 + 98346^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19825319411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275351623 + ... + 275351694.

Almost surely, 2^19825319412 is an apocalyptic number.

19825319412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19825319412 is an abundant number, since it is smaller than the sum of its proper divisors (30288682526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19825319412 is a wasteful number, since it uses less digits than its factorization.

19825319412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550703327 (or 550703322 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The spelling of 19825319412 in words is "nineteen billion, eight hundred twenty-five million, three hundred nineteen thousand, four hundred twelve".