99977555 has 8 divisors (see below), whose sum is σ = 120081744. Its totient is φ = 79909600.

The previous prime is 99977519. The next prime is 99977593. The reversal of 99977555 is 55577999.

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

It is not a de Polignac number, because 99977555 - 2⁸ = 99977299 is a prime.

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 99977555.

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, 2561 + ... + 14370.

It is an arithmetic number, because the mean of its divisors is an integer number (15010218).

Almost surely, 2^99977555 is an apocalyptic number.

99977555 is a deficient number, since it is larger than the sum of its proper divisors (20104189).

99977555 is a wasteful number, since it uses less digits than its factorization.

99977555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18117.

The product of its digits is 4465125, while the sum is 56.

The square root of 99977555 is about 9998.8776870207. The cubic root of 99977555 is about 464.1241539424.

The spelling of 99977555 in words is "ninety-nine million, nine hundred seventy-seven thousand, five hundred fifty-five".