77663085553 has 2 divisors, whose sum is σ = 77663085554. Its totient is φ = 77663085552.

The previous prime is 77663085473. The next prime is 77663085569. The reversal of 77663085553 is 35558036677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64641537009 + 13021548544 = 254247^2 + 114112^2 .

It is a cyclic number.

It is not a de Polignac number, because 77663085553 - 2¹³ = 77663077361 is a prime.

It is a super-2 number, since 2×77663085553² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77663085494 and 77663085503.

It is not a weakly prime, because it can be changed into another prime (77663085053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38831542776 + 38831542777.

It is an arithmetic number, because the mean of its divisors is an integer number (38831542777).

Almost surely, 2^77663085553 is an apocalyptic number.

It is an amenable number.

77663085553 is a deficient number, since it is larger than the sum of its proper divisors (1).

77663085553 is an equidigital number, since it uses as much as digits as its factorization.

77663085553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876000, while the sum is 55.

The spelling of 77663085553 in words is "seventy-seven billion, six hundred sixty-three million, eighty-five thousand, five hundred fifty-three".