19672587081 has 27 divisors (see below), whose sum is σ = 33060249261. Its totient is φ = 11239795224.

The previous prime is 19672587049. The next prime is 19672587097. The reversal of 19672587081 is 18078527691.

The square root of 19672587081 is 140259.

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

It is not a de Polignac number, because 19672587081 - 2⁵ = 19672587049 is a prime.

It is a super-2 number, since 2×19672587081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19672582081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2942100 + ... + 2948778.

Almost surely, 2^19672587081 is an apocalyptic number.

19672587081 is the 140259-th square number.

19672587081 is the 70130-th centered octagonal number.

It is an amenable number.

19672587081 is a deficient number, since it is larger than the sum of its proper divisors (13387662180).

19672587081 is an frugal number, since it uses more digits than its factorization.

19672587081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13378 (or 6689 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 54.

The spelling of 19672587081 in words is "nineteen billion, six hundred seventy-two million, five hundred eighty-seven thousand, eighty-one".