99955555 has 8 divisors (see below), whose sum is σ = 137081952. Its totient is φ = 68540928.

The previous prime is 99955519. The next prime is 99955567. The reversal of 99955555 is 55555999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99955555 - 2⁹ = 99955043 is a prime.

It is a super-2 number, since 2×99955555² = 19982225950716050, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1427902 + ... + 1427971.

It is an arithmetic number, because the mean of its divisors is an integer number (17135244).

Almost surely, 2^99955555 is an apocalyptic number.

99955555 is a deficient number, since it is larger than the sum of its proper divisors (37126397).

99955555 is a wasteful number, since it uses less digits than its factorization.

99955555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855885.

The product of its digits is 2278125, while the sum is 52.

The square root of 99955555 is about 9997.7775030254. Note that the first 3 decimals coincide. The cubic root of 99955555 is about 464.0901080326.

The spelling of 99955555 in words is "ninety-nine million, nine hundred fifty-five thousand, five hundred fifty-five".