77698197077 has 12 divisors (see below), whose sum is σ = 83388463620. Its totient is φ = 72373794816.

The previous prime is 77698197023. The next prime is 77698197097. The reversal of 77698197077 is 77079189677.

It can be written as a sum of positive squares in 6 ways, for example, as 14302007281 + 63396189796 = 119591^2 + 251786^2 .

It is not a de Polignac number, because 77698197077 - 2¹⁶ = 77698131541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77698196998 and 77698197016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77698197097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1357802 + ... + 1413867.

It is an arithmetic number, because the mean of its divisors is an integer number (6949038635).

Almost surely, 2^77698197077 is an apocalyptic number.

It is an amenable number.

77698197077 is a deficient number, since it is larger than the sum of its proper divisors (5690266543).

77698197077 is a wasteful number, since it uses less digits than its factorization.

77698197077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771800 (or 2771783 counting only the distinct ones).

The product of its (nonzero) digits is 65345616, while the sum is 68.

The spelling of 77698197077 in words is "seventy-seven billion, six hundred ninety-eight million, one hundred ninety-seven thousand, seventy-seven".