19934377646 has 8 divisors (see below), whose sum is σ = 30099590544. Its totient is φ = 9901180800.

The previous prime is 19934377643. The next prime is 19934377717. The reversal of 19934377646 is 64677343991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19934377643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33003635 + ... + 33004238.

It is an arithmetic number, because the mean of its divisors is an integer number (3762448818).

Almost surely, 2^19934377646 is an apocalyptic number.

19934377646 is a deficient number, since it is larger than the sum of its proper divisors (10165212898).

19934377646 is a wasteful number, since it uses less digits than its factorization.

19934377646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66008026.

The product of its digits is 20575296, while the sum is 59.

The spelling of 19934377646 in words is "nineteen billion, nine hundred thirty-four million, three hundred seventy-seven thousand, six hundred forty-six".