777672064621 has 2 divisors, whose sum is σ = 777672064622. Its totient is φ = 777672064620.

The previous prime is 777672064501. The next prime is 777672064657. The reversal of 777672064621 is 126460276777.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 598286780100 + 179385284521 = 773490^2 + 423539^2 .

It is a cyclic number.

It is not a de Polignac number, because 777672064621 - 2¹³ = 777672056429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (777672064921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388836032310 + 388836032311.

It is an arithmetic number, because the mean of its divisors is an integer number (388836032311).

Almost surely, 2^777672064621 is an apocalyptic number.

It is an amenable number.

777672064621 is a deficient number, since it is larger than the sum of its proper divisors (1).

777672064621 is an equidigital number, since it uses as much as digits as its factorization.

777672064621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8297856, while the sum is 55.

The spelling of 777672064621 in words is "seven hundred seventy-seven billion, six hundred seventy-two million, sixty-four thousand, six hundred twenty-one".