99779084851 has 4 divisors (see below), whose sum is σ = 102475816912. Its totient is φ = 97082352792.

The previous prime is 99779084849. The next prime is 99779084869. The reversal of 99779084851 is 15848097799.

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

It is a cyclic number.

It is not a de Polignac number, because 99779084851 - 2¹ = 99779084849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99779087851) by changing a digit.

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, 1348365975 + ... + 1348366048.

It is an arithmetic number, because the mean of its divisors is an integer number (25618954228).

Almost surely, 2^99779084851 is an apocalyptic number.

99779084851 is a deficient number, since it is larger than the sum of its proper divisors (2696732061).

99779084851 is a wasteful number, since it uses less digits than its factorization.

99779084851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2696732060.

The product of its (nonzero) digits is 45722880, while the sum is 67.

The spelling of 99779084851 in words is "ninety-nine billion, seven hundred seventy-nine million, eighty-four thousand, eight hundred fifty-one".