155969550 has 168 divisors, whose sum is σ = 475717320. Its totient is φ = 37713600.

The previous prime is 155969549. The next prime is 155969581. The reversal of 155969550 is 55969551.

155969550 is a `hidden beast` number, since 1 + 5 + 5 + 96 + 9 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155969496 and 155969505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 400756 + ... + 401144.

Almost surely, 2^155969550 is an apocalyptic number.

155969550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155969550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237858660).

155969550 is an abundant number, since it is smaller than the sum of its proper divisors (319747770).

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

155969550 is a wasteful number, since it uses less digits than its factorization.

155969550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 303750, while the sum is 45.

The square root of 155969550 is about 12488.7769617365. The cubic root of 155969550 is about 538.2862335398.

Subtracting from 155969550 its reverse (55969551), we obtain a palindrome (99999999).

The spelling of 155969550 in words is "one hundred fifty-five million, nine hundred sixty-nine thousand, five hundred fifty".