243215762761819 has 2 divisors, whose sum is σ = 243215762761820. Its totient is φ = 243215762761818.

The previous prime is 243215762761753. The next prime is 243215762761837. The reversal of 243215762761819 is 918167267512342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243215762761819 - 2²³ = 243215754373211 is a prime.

It is a super-2 number, since 2×243215762761819² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243215762701819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121607881380909 + 121607881380910.

It is an arithmetic number, because the mean of its divisors is an integer number (121607881380910).

Almost surely, 2^{243215762761819} is an apocalyptic number.

243215762761819 is a deficient number, since it is larger than the sum of its proper divisors (1).

243215762761819 is an equidigital number, since it uses as much as digits as its factorization.

243215762761819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60963840, while the sum is 64.

The spelling of 243215762761819 in words is "two hundred forty-three trillion, two hundred fifteen billion, seven hundred sixty-two million, seven hundred sixty-one thousand, eight hundred nineteen".