19763777985 has 32 divisors (see below), whose sum is σ = 37710766080. Its totient is φ = 8642048448.

The previous prime is 19763777977. The next prime is 19763778059. The reversal of 19763777985 is 58977736791.

It is not a de Polignac number, because 19763777985 - 2³ = 19763777977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4089465 + ... + 4094294.

It is an arithmetic number, because the mean of its divisors is an integer number (1178461440).

Almost surely, 2^19763777985 is an apocalyptic number.

19763777985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19763777985 is a deficient number, since it is larger than the sum of its proper divisors (17946988095).

19763777985 is a wasteful number, since it uses less digits than its factorization.

19763777985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8183797.

The product of its digits is 140026320, while the sum is 69.

The spelling of 19763777985 in words is "nineteen billion, seven hundred sixty-three million, seven hundred seventy-seven thousand, nine hundred eighty-five".