999995550 has 48 divisors (see below), whose sum is σ = 2482043520. Its totient is φ = 266444640.

The previous prime is 999995531. The next prime is 999995561. The reversal of 999995550 is 55599999.

It is a super-2 number, since 2×999995550² = 1999982200039605000, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265581 + ... + 269319.

It is an arithmetic number, because the mean of its divisors is an integer number (51709240).

Almost surely, 2^999995550 is an apocalyptic number.

999995550 is an abundant number, since it is smaller than the sum of its proper divisors (1482047970).

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

999995550 is a wasteful number, since it uses less digits than its factorization.

999995550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5537 (or 5532 counting only the distinct ones).

The product of its (nonzero) digits is 7381125, while the sum is 60.

The square root of 999995550 is about 31622.7062409276. The cubic root of 999995550 is about 999.9985166645.

The spelling of 999995550 in words is "nine hundred ninety-nine million, nine hundred ninety-five thousand, five hundred fifty".