999776677999 has 16 divisors (see below), whose sum is σ = 1094426315136. Its totient is φ = 905754981600.

The previous prime is 999776677961. The next prime is 999776678039.

999776677999 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 999776677999 - 2⁷ = 999776677871 is a prime.

It is a super-2 number, since 2×999776677999² (a number of 25 digits) contains 22 as substring.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999776677919) 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, 19787629 + ... + 19838089.

It is an arithmetic number, because the mean of its divisors is an integer number (68401644696).

Almost surely, 2^999776677999 is an apocalyptic number.

999776677999 is a deficient number, since it is larger than the sum of its proper divisors (94649637137).

999776677999 is a wasteful number, since it uses less digits than its factorization.

999776677999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56646.

The product of its digits is 45935634276, while the sum is 94.

The spelling of 999776677999 in words is "nine hundred ninety-nine billion, seven hundred seventy-six million, six hundred seventy-seven thousand, nine hundred ninety-nine".