19697841801 has 27 divisors (see below), whose sum is σ = 31281522727. Its totient is φ = 11935278960.

The previous prime is 19697841763. The next prime is 19697841851. The reversal of 19697841801 is 10814879691.

The square root of 19697841801 is 140349.

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

It can be written as a sum of positive squares in only one way, i.e., 2029052025 + 17668789776 = 45045^2 + 132924^2 .

It is not a de Polignac number, because 19697841801 - 2²⁹ = 19160970889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19697841851) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4629391 + ... + 4633643.

Almost surely, 2^19697841801 is an apocalyptic number.

19697841801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19697841801 is the 140349-th square number.

19697841801 is the 70175-th centered octagonal number.

It is an amenable number.

19697841801 is a deficient number, since it is larger than the sum of its proper divisors (11583680926).

19697841801 is an frugal number, since it uses more digits than its factorization.

19697841801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8534 (or 4267 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 19697841801 in words is "nineteen billion, six hundred ninety-seven million, eight hundred forty-one thousand, eight hundred one".