19772270331397 has 2 divisors, whose sum is σ = 19772270331398. Its totient is φ = 19772270331396.

The previous prime is 19772270331389. The next prime is 19772270331427. The reversal of 19772270331397 is 79313307227791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9949223669121 + 9823046662276 = 3154239^2 + 3134174^2 .

It is a cyclic number.

It is not a de Polignac number, because 19772270331397 - 2³ = 19772270331389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19772270331197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886135165698 + 9886135165699.

It is an arithmetic number, because the mean of its divisors is an integer number (9886135165699).

Almost surely, 2^{19772270331397} is an apocalyptic number.

It is an amenable number.

19772270331397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772270331397 is an equidigital number, since it uses as much as digits as its factorization.

19772270331397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21003948, while the sum is 61.

The spelling of 19772270331397 in words is "nineteen trillion, seven hundred seventy-two billion, two hundred seventy million, three hundred thirty-one thousand, three hundred ninety-seven".