999999977776 has 20 divisors (see below), whose sum is σ = 1939266171432. Its totient is φ = 499544191616.

The previous prime is 999999977731. The next prime is 999999977797. The reversal of 999999977776 is 677779999999.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28469230 + ... + 28504333.

Almost surely, 2^999999977776 is an apocalyptic number.

It is an amenable number.

999999977776 is a deficient number, since it is larger than the sum of its proper divisors (939266193656).

999999977776 is a wasteful number, since it uses less digits than its factorization.

999999977776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56974668 (or 56974662 counting only the distinct ones).

The product of its digits is 68903451414, while the sum is 97.

The spelling of 999999977776 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred seventy-seven thousand, seven hundred seventy-six".