99945555 has 16 divisors (see below), whose sum is σ = 160199424. Its totient is φ = 53208800.

The previous prime is 99945553. The next prime is 99945563. The reversal of 99945555 is 55554999.

It is not a de Polignac number, because 99945555 - 2¹ = 99945553 is a prime.

It is a super-2 number, since 2×99945555² = 19978227928516050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99945498 and 99945507.

It is not an unprimeable number, because it can be changed into a prime (99945553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3130 + ... + 14480.

It is an arithmetic number, because the mean of its divisors is an integer number (10012464).

Almost surely, 2^99945555 is an apocalyptic number.

99945555 is a deficient number, since it is larger than the sum of its proper divisors (60253869).

99945555 is a wasteful number, since it uses less digits than its factorization.

99945555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11946.

The product of its digits is 1822500, while the sum is 51.

The square root of 99945555 is about 9997.2773793668. The cubic root of 99945555 is about 464.0746309677.

The spelling of 99945555 in words is "ninety-nine million, nine hundred forty-five thousand, five hundred fifty-five".