19772254081 has 2 divisors, whose sum is σ = 19772254082. Its totient is φ = 19772254080.

The previous prime is 19772254043. The next prime is 19772254091. The reversal of 19772254081 is 18045227791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11682151056 + 8090103025 = 108084^2 + 89945^2 .

It is a cyclic number.

It is not a de Polignac number, because 19772254081 - 2²⁹ = 19235383169 is a prime.

It is a super-2 number, since 2×19772254081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19772254091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886127040 + 9886127041.

It is an arithmetic number, because the mean of its divisors is an integer number (9886127041).

Almost surely, 2^19772254081 is an apocalyptic number.

It is an amenable number.

19772254081 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772254081 is an equidigital number, since it uses as much as digits as its factorization.

19772254081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 19772254081 in words is "nineteen billion, seven hundred seventy-two million, two hundred fifty-four thousand, eighty-one".