77887905577 has 2 divisors, whose sum is σ = 77887905578. Its totient is φ = 77887905576.

The previous prime is 77887905559. The next prime is 77887905671. The reversal of 77887905577 is 77550978877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63552393216 + 14335512361 = 252096^2 + 119731^2 .

It is a cyclic number.

It is not a de Polignac number, because 77887905577 - 2¹⁹ = 77887381289 is a prime.

It is not a weakly prime, because it can be changed into another prime (77887905527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38943952788 + 38943952789.

It is an arithmetic number, because the mean of its divisors is an integer number (38943952789).

Almost surely, 2^77887905577 is an apocalyptic number.

It is an amenable number.

77887905577 is a deficient number, since it is larger than the sum of its proper divisors (1).

77887905577 is an equidigital number, since it uses as much as digits as its factorization.

77887905577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 242020800, while the sum is 70.

The spelling of 77887905577 in words is "seventy-seven billion, eight hundred eighty-seven million, nine hundred five thousand, five hundred seventy-seven".