155510311225 has 12 divisors (see below), whose sum is σ = 199482193260. Its totient is φ = 120118308800.

The previous prime is 155510311193. The next prime is 155510311249. The reversal of 155510311225 is 522113015551.

It can be written as a sum of positive squares in 6 ways, for example, as 214417449 + 155295893776 = 14643^2 + 394076^2 .

It is not a de Polignac number, because 155510311225 - 2⁵ = 155510311193 is a prime.

It is a super-2 number, since 2×155510311225² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107247766 + ... + 107249215.

It is an arithmetic number, because the mean of its divisors is an integer number (16623516105).

Almost surely, 2^155510311225 is an apocalyptic number.

It is an amenable number.

155510311225 is a deficient number, since it is larger than the sum of its proper divisors (43971882035).

155510311225 is a wasteful number, since it uses less digits than its factorization.

155510311225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214497020 (or 214497015 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 155510311225 its reverse (522113015551), we get a palindrome (677623326776).

The spelling of 155510311225 in words is "one hundred fifty-five billion, five hundred ten million, three hundred eleven thousand, two hundred twenty-five".