19661628642 has 16 divisors (see below), whose sum is σ = 39325342752. Its totient is φ = 6553528640.

The previous prime is 19661628607. The next prime is 19661628643. The reversal of 19661628642 is 24682616691.

It is not an unprimeable number, because it can be changed into a prime (19661628643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52993 + ... + 205259.

It is an arithmetic number, because the mean of its divisors is an integer number (2457833922).

Almost surely, 2^19661628642 is an apocalyptic number.

19661628642 is an abundant number, since it is smaller than the sum of its proper divisors (19663714110).

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

19661628642 is a wasteful number, since it uses less digits than its factorization.

19661628642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173793.

The product of its digits is 1492992, while the sum is 51.

The spelling of 19661628642 in words is "nineteen billion, six hundred sixty-one million, six hundred twenty-eight thousand, six hundred forty-two".