77807993420953 has 2 divisors, whose sum is σ = 77807993420954. Its totient is φ = 77807993420952.

The previous prime is 77807993420909. The next prime is 77807993421073. The reversal of 77807993420953 is 35902439970877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73667940498009 + 4140052922944 = 8583003^2 + 2034712^2 .

It is a cyclic number.

It is not a de Polignac number, because 77807993420953 - 2²¹ = 77807991323801 is a prime.

It is not a weakly prime, because it can be changed into another prime (77807993427953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38903996710476 + 38903996710477.

It is an arithmetic number, because the mean of its divisors is an integer number (38903996710477).

Almost surely, 2^{77807993420953} is an apocalyptic number.

It is an amenable number.

77807993420953 is a deficient number, since it is larger than the sum of its proper divisors (1).

77807993420953 is an equidigital number, since it uses as much as digits as its factorization.

77807993420953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720135360, while the sum is 73.

The spelling of 77807993420953 in words is "seventy-seven trillion, eight hundred seven billion, nine hundred ninety-three million, four hundred twenty thousand, nine hundred fifty-three".