19801075451 has 2 divisors, whose sum is σ = 19801075452. Its totient is φ = 19801075450.

The previous prime is 19801075423. The next prime is 19801075519. The reversal of 19801075451 is 15457010891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19801075451 - 2¹⁴ = 19801059067 is a prime.

It is a super-4 number, since 4×19801075451⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a junction number, because it is equal to n+sod(n) for n = 19801075399 and 19801075408.

It is not a weakly prime, because it can be changed into another prime (19801075421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9900537725 + 9900537726.

It is an arithmetic number, because the mean of its divisors is an integer number (9900537726).

Almost surely, 2^19801075451 is an apocalyptic number.

19801075451 is a deficient number, since it is larger than the sum of its proper divisors (1).

19801075451 is an equidigital number, since it uses as much as digits as its factorization.

19801075451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 19801075451 in words is "nineteen billion, eight hundred one million, seventy-five thousand, four hundred fifty-one".