19975308641 has 2 divisors, whose sum is σ = 19975308642. Its totient is φ = 19975308640.

The previous prime is 19975308611. The next prime is 19975308673. The reversal of 19975308641 is 14680357991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19719180625 + 256128016 = 140425^2 + 16004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19975308641 is a prime.

It is not a weakly prime, because it can be changed into another prime (19975308611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987654320 + 9987654321.

It is an arithmetic number, because the mean of its divisors is an integer number (9987654321).

Almost surely, 2^19975308641 is an apocalyptic number.

It is an amenable number.

19975308641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19975308641 is an equidigital number, since it uses as much as digits as its factorization.

19975308641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 19975308641 in words is "nineteen billion, nine hundred seventy-five million, three hundred eight thousand, six hundred forty-one".