77617662389 has 2 divisors, whose sum is σ = 77617662390. Its totient is φ = 77617662388.

The previous prime is 77617662371. The next prime is 77617662443. The reversal of 77617662389 is 98326671677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59422350289 + 18195312100 = 243767^2 + 134890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77617662389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77617662319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38808831194 + 38808831195.

It is an arithmetic number, because the mean of its divisors is an integer number (38808831195).

Almost surely, 2^77617662389 is an apocalyptic number.

It is an amenable number.

77617662389 is a deficient number, since it is larger than the sum of its proper divisors (1).

77617662389 is an equidigital number, since it uses as much as digits as its factorization.

77617662389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 62.

The spelling of 77617662389 in words is "seventy-seven billion, six hundred seventeen million, six hundred sixty-two thousand, three hundred eighty-nine".