155865552 has 20 divisors (see below), whose sum is σ = 402652800. Its totient is φ = 51955168.

The previous prime is 155865529. The next prime is 155865557. The reversal of 155865552 is 255568551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155865557) 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 3 ways as a sum of consecutive naturals, for example, 1623552 + ... + 1623647.

It is an arithmetic number, because the mean of its divisors is an integer number (20132640).

Almost surely, 2^155865552 is an apocalyptic number.

155865552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155865552 is an abundant number, since it is smaller than the sum of its proper divisors (246787248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155865552 is a wasteful number, since it uses less digits than its factorization.

155865552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247210 (or 3247204 counting only the distinct ones).

The product of its digits is 300000, while the sum is 42.

The square root of 155865552 is about 12484.6126091281. The cubic root of 155865552 is about 538.1665667231.

The spelling of 155865552 in words is "one hundred fifty-five million, eight hundred sixty-five thousand, five hundred fifty-two".