263219870197 has 2 divisors, whose sum is σ = 263219870198. Its totient is φ = 263219870196.

The previous prime is 263219870183. The next prime is 263219870261. The reversal of 263219870197 is 791078912362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251914651921 + 11305218276 = 501911^2 + 106326^2 .

It is a cyclic number.

It is not a de Polignac number, because 263219870197 - 2¹⁵ = 263219837429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263219870597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131609935098 + 131609935099.

It is an arithmetic number, because the mean of its divisors is an integer number (131609935099).

Almost surely, 2^263219870197 is an apocalyptic number.

It is an amenable number.

263219870197 is a deficient number, since it is larger than the sum of its proper divisors (1).

263219870197 is an equidigital number, since it uses as much as digits as its factorization.

263219870197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 263219870197 in words is "two hundred sixty-three billion, two hundred nineteen million, eight hundred seventy thousand, one hundred ninety-seven".