155000025 has 18 divisors (see below), whose sum is σ = 277622670. Its totient is φ = 82666560.

The previous prime is 155000023. The next prime is 155000039. The reversal of 155000025 is 520000551.

It can be written as a sum of positive squares in 3 ways, for example, as 1710864 + 153289161 = 1308^2 + 12381^2 .

It is not a de Polignac number, because 155000025 - 2¹ = 155000023 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 154999971 and 155000007.

It is not an unprimeable number, because it can be changed into a prime (155000023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 344220 + ... + 344669.

Almost surely, 2^155000025 is an apocalyptic number.

155000025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155000025 is a deficient number, since it is larger than the sum of its proper divisors (122622645).

155000025 is a wasteful number, since it uses less digits than its factorization.

155000025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688905 (or 688897 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 155000025 is about 12449.9006020129. The cubic root of 155000025 is about 537.1685643745.

Adding to 155000025 its reverse (520000551), we get a palindrome (675000576).

It can be divided in two parts, 1550000 and 25, that added together give a square (1550025 = 1245²).

The spelling of 155000025 in words is "one hundred fifty-five million, twenty-five", and thus it is an aban number.