19671745536 has 165 divisors, whose sum is σ = 58864549359. Its totient is φ = 6543783936.

The previous prime is 19671745441. The next prime is 19671745553. The reversal of 19671745536 is 63554717691.

The square root of 19671745536 is 140256.

It is a perfect power (a square), and thus also a powerful number.

19671745536 is a `hidden beast` number, since 1 + 9 + 67 + 1 + 7 + 45 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 40393485 + ... + 40393971.

Almost surely, 2^19671745536 is an apocalyptic number.

19671745536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19671745536 is the 140256-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19671745536

19671745536 is an abundant number, since it is smaller than the sum of its proper divisors (39192803823).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19671745536 is an frugal number, since it uses more digits than its factorization.

19671745536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 492 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The spelling of 19671745536 in words is "nineteen billion, six hundred seventy-one million, seven hundred forty-five thousand, five hundred thirty-six".