155387421853 has 2 divisors, whose sum is σ = 155387421854. Its totient is φ = 155387421852.

The previous prime is 155387421841. The next prime is 155387421863. The reversal of 155387421853 is 358124783551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115292165209 + 40095256644 = 339547^2 + 200238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155387421853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155387421853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155387421823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77693710926 + 77693710927.

It is an arithmetic number, because the mean of its divisors is an integer number (77693710927).

Almost surely, 2^155387421853 is an apocalyptic number.

It is an amenable number.

155387421853 is a deficient number, since it is larger than the sum of its proper divisors (1).

155387421853 is an equidigital number, since it uses as much as digits as its factorization.

155387421853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 52.

The spelling of 155387421853 in words is "one hundred fifty-five billion, three hundred eighty-seven million, four hundred twenty-one thousand, eight hundred fifty-three".