25617666077 has 2 divisors, whose sum is σ = 25617666078. Its totient is φ = 25617666076.

The previous prime is 25617666049. The next prime is 25617666083. The reversal of 25617666077 is 77066671652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25617282916 + 383161 = 160054^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 25617666077 - 2³² = 21322698781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25617666007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12808833038 + 12808833039.

It is an arithmetic number, because the mean of its divisors is an integer number (12808833039).

Almost surely, 2^25617666077 is an apocalyptic number.

It is an amenable number.

25617666077 is a deficient number, since it is larger than the sum of its proper divisors (1).

25617666077 is an equidigital number, since it uses as much as digits as its factorization.

25617666077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4445280, while the sum is 53.

The spelling of 25617666077 in words is "twenty-five billion, six hundred seventeen million, six hundred sixty-six thousand, seventy-seven".