19668776085 has 24 divisors (see below), whose sum is σ = 38962909440. Its totient is φ = 8991440352.

The previous prime is 19668776081. The next prime is 19668776089. The reversal of 19668776085 is 58067786691.

19668776085 is a `hidden beast` number, since 19 + 6 + 6 + 8 + 7 + 7 + 608 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (19668776081) and next prime (19668776089).

It is not a de Polignac number, because 19668776085 - 2² = 19668776081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19668776081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31219965 + ... + 31220594.

It is an arithmetic number, because the mean of its divisors is an integer number (1623454560).

Almost surely, 2^19668776085 is an apocalyptic number.

19668776085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19668776085 is a deficient number, since it is larger than the sum of its proper divisors (19294133355).

19668776085 is a wasteful number, since it uses less digits than its factorization.

19668776085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62440577 (or 62440574 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 19668776085 in words is "nineteen billion, six hundred sixty-eight million, seven hundred seventy-six thousand, eighty-five".