99777955 has 4 divisors (see below), whose sum is σ = 119733552. Its totient is φ = 79822360.

The previous prime is 99777943. The next prime is 99777967. The reversal of 99777955 is 55977799.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (99777943) and next prime (99777967).

It is not a de Polignac number, because 99777955 - 2⁹ = 99777443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99777955.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9977791 + ... + 9977800.

It is an arithmetic number, because the mean of its divisors is an integer number (29933388).

Almost surely, 2^99777955 is an apocalyptic number.

99777955 is a deficient number, since it is larger than the sum of its proper divisors (19955597).

99777955 is a wasteful number, since it uses less digits than its factorization.

99777955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19955596.

The product of its digits is 6251175, while the sum is 58.

The square root of 99777955 is about 9988.8915801504. The cubic root of 99777955 is about 463.8150815732.

It can be divided in two parts, 997779 and 55, that multiplied together give a palindrome (54877845).

The spelling of 99777955 in words is "ninety-nine million, seven hundred seventy-seven thousand, nine hundred fifty-five".