19867402601 has 2 divisors, whose sum is σ = 19867402602. Its totient is φ = 19867402600.

The previous prime is 19867402591. The next prime is 19867402619. The reversal of 19867402601 is 10620476891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19009791376 + 857611225 = 137876^2 + 29285^2 .

It is an emirp because it is prime and its reverse (10620476891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19867402601 - 2⁶ = 19867402537 is a prime.

It is a super-2 number, since 2×19867402601² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19867402201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9933701300 + 9933701301.

It is an arithmetic number, because the mean of its divisors is an integer number (9933701301).

Almost surely, 2^19867402601 is an apocalyptic number.

It is an amenable number.

19867402601 is a deficient number, since it is larger than the sum of its proper divisors (1).

19867402601 is an equidigital number, since it uses as much as digits as its factorization.

19867402601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 19867402601 in words is "nineteen billion, eight hundred sixty-seven million, four hundred two thousand, six hundred one".