977779797977 has 2 divisors, whose sum is σ = 977779797978.
Its totient is φ = 977779797976.
The previous prime is 977779797899. The next prime is 977779797979. The reversal of 977779797977 is 779797977779.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 896996515801 + 80783282176 = 947099^2 + 284224^2
It is a cyclic number.
It is not a de Polignac number, because 977779797977 - 230 = 976706056153 is a prime.
Together with 977779797979, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (977779797979) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488889898988 + 488889898989.
It is an arithmetic number, because the mean of its divisors is an integer number (488889898989).
Almost surely, 2977779797977 is an apocalyptic number.
It is an amenable number.
977779797977 is a deficient number, since it is larger than the sum of its proper divisors (1).
977779797977 is an equidigital number, since it uses as much as digits as its factorization.
977779797977 is an evil number, because the sum of its binary digits is even.
The product of its digits is 37822859361, while the sum is 92.
The spelling of 977779797977 in words is "nine hundred seventy-seven billion, seven hundred seventy-nine million, seven hundred ninety-seven thousand, nine hundred seventy-seven".