77743618553761 has 2 divisors, whose sum is σ = 77743618553762. Its totient is φ = 77743618553760.

The previous prime is 77743618553743. The next prime is 77743618553827. The reversal of 77743618553761 is 16735581634777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72016116585361 + 5727501968400 = 8486231^2 + 2393220^2 .

It is a cyclic number.

It is not a de Polignac number, because 77743618553761 - 2⁴⁵ = 42559246464929 is a prime.

It is not a weakly prime, because it can be changed into another prime (77743618523761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38871809276880 + 38871809276881.

It is an arithmetic number, because the mean of its divisors is an integer number (38871809276881).

Almost surely, 2^{77743618553761} is an apocalyptic number.

It is an amenable number.

77743618553761 is a deficient number, since it is larger than the sum of its proper divisors (1).

77743618553761 is an equidigital number, since it uses as much as digits as its factorization.

77743618553761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622339200, while the sum is 70.

The spelling of 77743618553761 in words is "seventy-seven trillion, seven hundred forty-three billion, six hundred eighteen million, five hundred fifty-three thousand, seven hundred sixty-one".