87792781877 has 2 divisors, whose sum is σ = 87792781878. Its totient is φ = 87792781876.

The previous prime is 87792781871. The next prime is 87792781891. The reversal of 87792781877 is 77818729778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79633453636 + 8159328241 = 282194^2 + 90329^2 .

It is a cyclic number.

It is not a de Polignac number, because 87792781877 - 2¹⁸ = 87792519733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87792781877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87792781871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43896390938 + 43896390939.

It is an arithmetic number, because the mean of its divisors is an integer number (43896390939).

Almost surely, 2^87792781877 is an apocalyptic number.

It is an amenable number.

87792781877 is a deficient number, since it is larger than the sum of its proper divisors (1).

87792781877 is an equidigital number, since it uses as much as digits as its factorization.

87792781877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 154893312, while the sum is 71.

The spelling of 87792781877 in words is "eighty-seven billion, seven hundred ninety-two million, seven hundred eighty-one thousand, eight hundred seventy-seven".