12155320451969 has 2 divisors, whose sum is σ = 12155320451970. Its totient is φ = 12155320451968.

The previous prime is 12155320451959. The next prime is 12155320452013. The reversal of 12155320451969 is 96915402355121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10531887712369 + 1623432739600 = 3245287^2 + 1274140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12155320451969 is a prime.

It is a super-2 number, since 2×12155320451969² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12155320451969.

It is not a weakly prime, because it can be changed into another prime (12155320451909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077660225984 + 6077660225985.

It is an arithmetic number, because the mean of its divisors is an integer number (6077660225985).

Almost surely, 2^{12155320451969} is an apocalyptic number.

It is an amenable number.

12155320451969 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155320451969 is an equidigital number, since it uses as much as digits as its factorization.

12155320451969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 12155320451969 in words is "twelve trillion, one hundred fifty-five billion, three hundred twenty million, four hundred fifty-one thousand, nine hundred sixty-nine".