19876946641 has 2 divisors, whose sum is σ = 19876946642. Its totient is φ = 19876946640.

The previous prime is 19876946549. The next prime is 19876946651. The reversal of 19876946641 is 14664967891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19405883025 + 471063616 = 139305^2 + 21704^2 .

It is a cyclic number.

It is not a de Polignac number, because 19876946641 - 2⁹ = 19876946129 is a prime.

It is a super-2 number, since 2×19876946641² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19876946641.

It is not a weakly prime, because it can be changed into another prime (19876946651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9938473320 + 9938473321.

It is an arithmetic number, because the mean of its divisors is an integer number (9938473321).

Almost surely, 2^19876946641 is an apocalyptic number.

It is an amenable number.

19876946641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19876946641 is an equidigital number, since it uses as much as digits as its factorization.

19876946641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 61.

The spelling of 19876946641 in words is "nineteen billion, eight hundred seventy-six million, nine hundred forty-six thousand, six hundred forty-one".