155840522969 has 2 divisors, whose sum is σ = 155840522970. Its totient is φ = 155840522968.

The previous prime is 155840522951. The next prime is 155840522983. The reversal of 155840522969 is 969225048551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103941760000 + 51898762969 = 322400^2 + 227813^2 .

It is a cyclic number.

It is not a de Polignac number, because 155840522969 - 2²⁸ = 155572087513 is a prime.

It is a super-2 number, since 2×155840522969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155840522939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77920261484 + 77920261485.

It is an arithmetic number, because the mean of its divisors is an integer number (77920261485).

Almost surely, 2^155840522969 is an apocalyptic number.

It is an amenable number.

155840522969 is a deficient number, since it is larger than the sum of its proper divisors (1).

155840522969 is an equidigital number, since it uses as much as digits as its factorization.

155840522969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776000, while the sum is 56.

The spelling of 155840522969 in words is "one hundred fifty-five billion, eight hundred forty million, five hundred twenty-two thousand, nine hundred sixty-nine".