19763246981 has 2 divisors, whose sum is σ = 19763246982. Its totient is φ = 19763246980.

The previous prime is 19763246977. The next prime is 19763246989. The reversal of 19763246981 is 18964236791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14720968900 + 5042278081 = 121330^2 + 71009^2 .

It is an emirp because it is prime and its reverse (18964236791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19763246981 - 2² = 19763246977 is a prime.

It is a super-2 number, since 2×19763246981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19763246989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9881623490 + 9881623491.

It is an arithmetic number, because the mean of its divisors is an integer number (9881623491).

Almost surely, 2^19763246981 is an apocalyptic number.

It is an amenable number.

19763246981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19763246981 is an equidigital number, since it uses as much as digits as its factorization.

19763246981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

The spelling of 19763246981 in words is "nineteen billion, seven hundred sixty-three million, two hundred forty-six thousand, nine hundred eighty-one".