77172428474929 has 2 divisors, whose sum is σ = 77172428474930. Its totient is φ = 77172428474928.

The previous prime is 77172428474881. The next prime is 77172428474971. The reversal of 77172428474929 is 92947482427177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54643659858225 + 22528768616704 = 7392135^2 + 4746448^2 .

It is a cyclic number.

It is not a de Polignac number, because 77172428474929 - 2⁴³ = 68376335452721 is a prime.

It is not a weakly prime, because it can be changed into another prime (77172428424929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38586214237464 + 38586214237465.

It is an arithmetic number, because the mean of its divisors is an integer number (38586214237465).

Almost surely, 2^{77172428474929} is an apocalyptic number.

It is an amenable number.

77172428474929 is a deficient number, since it is larger than the sum of its proper divisors (1).

77172428474929 is an equidigital number, since it uses as much as digits as its factorization.

77172428474929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 796594176, while the sum is 73.

The spelling of 77172428474929 in words is "seventy-seven trillion, one hundred seventy-two billion, four hundred twenty-eight million, four hundred seventy-four thousand, nine hundred twenty-nine".