155515253231477 has 2 divisors, whose sum is σ = 155515253231478. Its totient is φ = 155515253231476.

The previous prime is 155515253231417. The next prime is 155515253231539. The reversal of 155515253231477 is 774132352515551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139242855614641 + 16272397616836 = 11800121^2 + 4033906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155515253231477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155515253231417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77757626615738 + 77757626615739.

It is an arithmetic number, because the mean of its divisors is an integer number (77757626615739).

Almost surely, 2^{155515253231477} is an apocalyptic number.

It is an amenable number.

155515253231477 is a deficient number, since it is larger than the sum of its proper divisors (1).

155515253231477 is an equidigital number, since it uses as much as digits as its factorization.

155515253231477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050000, while the sum is 56.

The spelling of 155515253231477 in words is "one hundred fifty-five trillion, five hundred fifteen billion, two hundred fifty-three million, two hundred thirty-one thousand, four hundred seventy-seven".