155551550 has 72 divisors (see below), whose sum is σ = 363549648. Its totient is φ = 48470400.

The previous prime is 155551549. The next prime is 155551577. The reversal of 155551550 is 55155551.

155551550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 40514 + ... + 44186.

Almost surely, 2^155551550 is an apocalyptic number.

155551550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155551550 is an abundant number, since it is smaller than the sum of its proper divisors (207998098).

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

155551550 is a wasteful number, since it uses less digits than its factorization.

155551550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714 (or 3698 counting only the distinct ones).

The product of its (nonzero) digits is 15625, while the sum is 32.

The square root of 155551550 is about 12472.0307087499. The cubic root of 155551550 is about 537.8049324366.

The spelling of 155551550 in words is "one hundred fifty-five million, five hundred fifty-one thousand, five hundred fifty".