19666979534 has 16 divisors (see below), whose sum is σ = 31066947600. Its totient is φ = 9311791104.

The previous prime is 19666979491. The next prime is 19666979609. The reversal of 19666979534 is 43597966691.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 27827 + ... + 200270.

It is an arithmetic number, because the mean of its divisors is an integer number (1941684225).

Almost surely, 2^19666979534 is an apocalyptic number.

19666979534 is a deficient number, since it is larger than the sum of its proper divisors (11399968066).

19666979534 is a wasteful number, since it uses less digits than its factorization.

19666979534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230387.

The product of its digits is 66134880, while the sum is 65.

The spelling of 19666979534 in words is "nineteen billion, six hundred sixty-six million, nine hundred seventy-nine thousand, five hundred thirty-four".