19958400001 has 2 divisors, whose sum is σ = 19958400002. Its totient is φ = 19958400000.

The previous prime is 19958399999. The next prime is 19958400037. The reversal of 19958400001 is 10000485991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17642480625 + 2315919376 = 132825^2 + 48124^2 .

It is a cyclic number.

It is not a de Polignac number, because 19958400001 - 2¹ = 19958399999 is a prime.

Together with 19958399999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19958400601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9979200000 + 9979200001.

It is an arithmetic number, because the mean of its divisors is an integer number (9979200001).

Almost surely, 2^19958400001 is an apocalyptic number.

It is an amenable number.

19958400001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19958400001 is an equidigital number, since it uses as much as digits as its factorization.

19958400001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

Adding to 19958400001 its reverse (10000485991), we get a palindrome (29958885992).

The spelling of 19958400001 in words is "nineteen billion, nine hundred fifty-eight million, four hundred thousand, one".