19691985142 has 16 divisors (see below), whose sum is σ = 29983826160. Its totient is φ = 9697425408.

The previous prime is 19691985097. The next prime is 19691985143. The reversal of 19691985142 is 24158919691.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19691985143) 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, 1430838 + ... + 1444534.

It is an arithmetic number, because the mean of its divisors is an integer number (1873989135).

Almost surely, 2^19691985142 is an apocalyptic number.

19691985142 is a deficient number, since it is larger than the sum of its proper divisors (10291841018).

19691985142 is a wasteful number, since it uses less digits than its factorization.

19691985142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24495.

The product of its digits is 1399680, while the sum is 55.

The spelling of 19691985142 in words is "nineteen billion, six hundred ninety-one million, nine hundred eighty-five thousand, one hundred forty-two".