77473642861 has 2 divisors, whose sum is σ = 77473642862. Its totient is φ = 77473642860.

The previous prime is 77473642837. The next prime is 77473642969. The reversal of 77473642861 is 16824637477.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62885592900 + 14588049961 = 250770^2 + 120781^2 .

It is a cyclic number.

It is not a de Polignac number, because 77473642861 - 2³³ = 68883708269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77473642661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38736821430 + 38736821431.

It is an arithmetic number, because the mean of its divisors is an integer number (38736821431).

Almost surely, 2^77473642861 is an apocalyptic number.

It is an amenable number.

77473642861 is a deficient number, since it is larger than the sum of its proper divisors (1).

77473642861 is an equidigital number, since it uses as much as digits as its factorization.

77473642861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 55.

The spelling of 77473642861 in words is "seventy-seven billion, four hundred seventy-three million, six hundred forty-two thousand, eight hundred sixty-one".