19506453397 has 2 divisors, whose sum is σ = 19506453398. Its totient is φ = 19506453396.

The previous prime is 19506453389. The next prime is 19506453409. The reversal of 19506453397 is 79335460591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13643641636 + 5862811761 = 116806^2 + 76569^2 .

It is a cyclic number.

It is not a de Polignac number, because 19506453397 - 2³ = 19506453389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19506453347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9753226698 + 9753226699.

It is an arithmetic number, because the mean of its divisors is an integer number (9753226699).

Almost surely, 2^19506453397 is an apocalyptic number.

It is an amenable number.

19506453397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19506453397 is an equidigital number, since it uses as much as digits as its factorization.

19506453397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3061800, while the sum is 52.

The spelling of 19506453397 in words is "nineteen billion, five hundred six million, four hundred fifty-three thousand, three hundred ninety-seven".