19577428081 has 4 divisors (see below), whose sum is σ = 19993969152. Its totient is φ = 19160887012.

The previous prime is 19577428037. The next prime is 19577428093. The reversal of 19577428081 is 18082477591.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18082477591 = 683 ⋅26475077.

It is a cyclic number.

It is not a de Polignac number, because 19577428081 - 2¹⁹ = 19576903793 is a prime.

It is a super-2 number, since 2×19577428081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19577428001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208270465 + ... + 208270558.

It is an arithmetic number, because the mean of its divisors is an integer number (4998492288).

Almost surely, 2^19577428081 is an apocalyptic number.

It is an amenable number.

19577428081 is a deficient number, since it is larger than the sum of its proper divisors (416541071).

19577428081 is an equidigital number, since it uses as much as digits as its factorization.

19577428081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416541070.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 19577428081 in words is "nineteen billion, five hundred seventy-seven million, four hundred twenty-eight thousand, eighty-one".