77938122277 has 16 divisors (see below), whose sum is σ = 80706542832. Its totient is φ = 75227443200.

The previous prime is 77938122217. The next prime is 77938122313. The reversal of 77938122277 is 77222183977.

It is a Cunningham number, because it is equal to 279174²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 10337602276 + 67600520001 = 101674^2 + 260001^2 .

It is a cyclic number.

It is not a de Polignac number, because 77938122277 - 2¹⁹ = 77937597989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77938122217) 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, 794053 + ... + 886789.

It is an arithmetic number, because the mean of its divisors is an integer number (5044158927).

Almost surely, 2^77938122277 is an apocalyptic number.

It is an amenable number.

77938122277 is a deficient number, since it is larger than the sum of its proper divisors (2768420555).

77938122277 is a wasteful number, since it uses less digits than its factorization.

77938122277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93048.

The product of its digits is 4148928, while the sum is 55.

The spelling of 77938122277 in words is "seventy-seven billion, nine hundred thirty-eight million, one hundred twenty-two thousand, two hundred seventy-seven".