19928513779201 has 4 divisors (see below), whose sum is σ = 19935974850304. Its totient is φ = 19921052708100.

The previous prime is 19928513779177. The next prime is 19928513779211. The reversal of 19928513779201 is 10297731582991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19928513779201 - 2⁹ = 19928513778689 is a prime.

It is a super-2 number, since 2×19928513779201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19928513779211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3730531545 + ... + 3730536886.

It is an arithmetic number, because the mean of its divisors is an integer number (4983993712576).

Almost surely, 2^{19928513779201} is an apocalyptic number.

It is an amenable number.

19928513779201 is a deficient number, since it is larger than the sum of its proper divisors (7461071103).

19928513779201 is an equidigital number, since it uses as much as digits as its factorization.

19928513779201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461071102.

The product of its (nonzero) digits is 17146080, while the sum is 64.

The spelling of 19928513779201 in words is "nineteen trillion, nine hundred twenty-eight billion, five hundred thirteen million, seven hundred seventy-nine thousand, two hundred one".