11999939977 has 2 divisors, whose sum is σ = 11999939978. Its totient is φ = 11999939976.

The previous prime is 11999939929. The next prime is 11999939981. The reversal of 11999939977 is 77993999911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10773609616 + 1226330361 = 103796^2 + 35019^2 .

It is a cyclic number.

It is not a de Polignac number, because 11999939977 - 2¹⁹ = 11999415689 is a prime.

It is not a weakly prime, because it can be changed into another prime (11999939177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5999969988 + 5999969989.

It is an arithmetic number, because the mean of its divisors is an integer number (5999969989).

Almost surely, 2^11999939977 is an apocalyptic number.

It is an amenable number.

11999939977 is a deficient number, since it is larger than the sum of its proper divisors (1).

11999939977 is an equidigital number, since it uses as much as digits as its factorization.

11999939977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78121827, while the sum is 73.

The spelling of 11999939977 in words is "eleven billion, nine hundred ninety-nine million, nine hundred thirty-nine thousand, nine hundred seventy-seven".