19802009901 has 8 divisors (see below), whose sum is σ = 26405386144. Its totient is φ = 13199986800.

The previous prime is 19802009897. The next prime is 19802009923. The reversal of 19802009901 is 10990020891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19802009901 - 2² = 19802009897 is a prime.

It is a super-2 number, since 2×19802009901² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19802009901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19802009951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303631 + ... + 363036.

It is an arithmetic number, because the mean of its divisors is an integer number (3300673268).

Almost surely, 2^19802009901 is an apocalyptic number.

It is an amenable number.

19802009901 is a deficient number, since it is larger than the sum of its proper divisors (6603376243).

19802009901 is an equidigital number, since it uses as much as digits as its factorization.

19802009901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676571.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 19802009901 in words is "nineteen billion, eight hundred two million, nine thousand, nine hundred one".