99995555 has 32 divisors (see below), whose sum is σ = 135364608. Its totient is φ = 70288000.

The previous prime is 99995551. The next prime is 99995563. The reversal of 99995555 is 55559999.

It is not a de Polignac number, because 99995555 - 2² = 99995551 is a prime.

It is a super-2 number, since 2×99995555² = 19998222039516050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99995555.

It is not an unprimeable number, because it can be changed into a prime (99995551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260894 + ... + 261276.

It is an arithmetic number, because the mean of its divisors is an integer number (4230144).

Almost surely, 2^99995555 is an apocalyptic number.

99995555 is a deficient number, since it is larger than the sum of its proper divisors (35369053).

99995555 is a wasteful number, since it uses less digits than its factorization.

99995555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547.

The product of its digits is 4100625, while the sum is 56.

The square root of 99995555 is about 9999.7777475302. Note that the first 4 decimals coincide. The cubic root of 99995555 is about 464.1520059719.

Subtracting from 99995555 its reverse (55559999), we obtain a square (44435556 = 6666²).

The spelling of 99995555 in words is "ninety-nine million, nine hundred ninety-five thousand, five hundred fifty-five".