155494841917 has 2 divisors, whose sum is σ = 155494841918. Its totient is φ = 155494841916.

The previous prime is 155494841903. The next prime is 155494841921. The reversal of 155494841917 is 719148494551.

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., 140200820356 + 15294021561 = 374434^2 + 123669^2 .

It is a cyclic number.

It is not a de Polignac number, because 155494841917 - 2¹¹ = 155494839869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155494841977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77747420958 + 77747420959.

It is an arithmetic number, because the mean of its divisors is an integer number (77747420959).

Almost surely, 2^155494841917 is an apocalyptic number.

It is an amenable number.

155494841917 is a deficient number, since it is larger than the sum of its proper divisors (1).

155494841917 is an equidigital number, since it uses as much as digits as its factorization.

155494841917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 58.

The spelling of 155494841917 in words is "one hundred fifty-five billion, four hundred ninety-four million, eight hundred forty-one thousand, nine hundred seventeen".