19766454457 has 16 divisors (see below), whose sum is σ = 20583932544. Its totient is φ = 18970560000.

The previous prime is 19766454451. The next prime is 19766454479. The reversal of 19766454457 is 75445466791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19766454457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19766454451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396582 + ... + 443632.

It is an arithmetic number, because the mean of its divisors is an integer number (1286495784).

Almost surely, 2^19766454457 is an apocalyptic number.

It is an amenable number.

19766454457 is a deficient number, since it is larger than the sum of its proper divisors (817478087).

19766454457 is an equidigital number, since it uses as much as digits as its factorization.

19766454457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47280.

The product of its digits is 25401600, while the sum is 58.

The spelling of 19766454457 in words is "nineteen billion, seven hundred sixty-six million, four hundred fifty-four thousand, four hundred fifty-seven".