36773766721 has 2 divisors, whose sum is σ = 36773766722. Its totient is φ = 36773766720.

The previous prime is 36773766677. The next prime is 36773766727. The reversal of 36773766721 is 12766737763.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36696766096 + 77000625 = 191564^2 + 8775^2 .

It is a cyclic number.

It is not a de Polignac number, because 36773766721 - 2¹³ = 36773758529 is a prime.

It is not a weakly prime, because it can be changed into another prime (36773766727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18386883360 + 18386883361.

It is an arithmetic number, because the mean of its divisors is an integer number (18386883361).

Almost surely, 2^36773766721 is an apocalyptic number.

It is an amenable number.

36773766721 is a deficient number, since it is larger than the sum of its proper divisors (1).

36773766721 is an equidigital number, since it uses as much as digits as its factorization.

36773766721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9335088, while the sum is 55.

The spelling of 36773766721 in words is "thirty-six billion, seven hundred seventy-three million, seven hundred sixty-six thousand, seven hundred twenty-one".