19806065530 has 16 divisors (see below), whose sum is σ = 35807974560. Its totient is φ = 7887524752.

The previous prime is 19806065491. The next prime is 19806065537. The reversal of 19806065530 is 3556060891.

It is not an unprimeable number, because it can be changed into a prime (19806065537) 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, 4360300 + ... + 4364839.

It is an arithmetic number, because the mean of its divisors is an integer number (2237998410).

Almost surely, 2^19806065530 is an apocalyptic number.

19806065530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19806065530 is a deficient number, since it is larger than the sum of its proper divisors (16001909030).

19806065530 is a wasteful number, since it uses less digits than its factorization.

19806065530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8725373.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 19806065530 in words is "nineteen billion, eight hundred six million, sixty-five thousand, five hundred thirty".