19955767457 has 2 divisors, whose sum is σ = 19955767458. Its totient is φ = 19955767456.

The previous prime is 19955767453. The next prime is 19955767463. The reversal of 19955767457 is 75476755991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19539566656 + 416200801 = 139784^2 + 20401^2 .

It is a cyclic number.

It is not a de Polignac number, because 19955767457 - 2² = 19955767453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19955767393 and 19955767402.

It is not a weakly prime, because it can be changed into another prime (19955767451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977883728 + 9977883729.

It is an arithmetic number, because the mean of its divisors is an integer number (9977883729).

Almost surely, 2^19955767457 is an apocalyptic number.

It is an amenable number.

19955767457 is a deficient number, since it is larger than the sum of its proper divisors (1).

19955767457 is an equidigital number, since it uses as much as digits as its factorization.

19955767457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83349000, while the sum is 65.

The spelling of 19955767457 in words is "nineteen billion, nine hundred fifty-five million, seven hundred sixty-seven thousand, four hundred fifty-seven".