764644065077 has 2 divisors, whose sum is σ = 764644065078. Its totient is φ = 764644065076.

The previous prime is 764644065023. The next prime is 764644065079. The reversal of 764644065077 is 770560446467.

764644065077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670050296356 + 94593768721 = 818566^2 + 307561^2 .

It is a cyclic number.

It is not a de Polignac number, because 764644065077 - 2²⁴ = 764627287861 is a prime.

It is a super-2 number, since 2×764644065077² (a number of 25 digits) contains 22 as substring.

Together with 764644065079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764644065079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382322032538 + 382322032539.

It is an arithmetic number, because the mean of its divisors is an integer number (382322032539).

Almost surely, 2^764644065077 is an apocalyptic number.

It is an amenable number.

764644065077 is a deficient number, since it is larger than the sum of its proper divisors (1).

764644065077 is an equidigital number, since it uses as much as digits as its factorization.

764644065077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23708160, while the sum is 56.

The spelling of 764644065077 in words is "seven hundred sixty-four billion, six hundred forty-four million, sixty-five thousand, seventy-seven".