155525661 has 12 divisors (see below), whose sum is σ = 228331740. Its totient is φ = 101983680.

The previous prime is 155525653. The next prime is 155525683. The reversal of 155525661 is 166525551.

It can be written as a sum of positive squares in 2 ways, for example, as 13176900 + 142348761 = 3630^2 + 11931^2 .

It is not a de Polignac number, because 155525661 - 2³ = 155525653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155525611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141096 + ... + 142193.

It is an arithmetic number, because the mean of its divisors is an integer number (19027645).

Almost surely, 2^155525661 is an apocalyptic number.

It is an amenable number.

155525661 is a deficient number, since it is larger than the sum of its proper divisors (72806079).

155525661 is a wasteful number, since it uses less digits than its factorization.

155525661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283356 (or 283353 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 155525661 is about 12470.9927832551. The cubic root of 155525661 is about 537.7750945160.

The spelling of 155525661 in words is "one hundred fifty-five million, five hundred twenty-five thousand, six hundred sixty-one".