77770505021427 has 24 divisors (see below), whose sum is σ = 116209283867040. Its totient is φ = 50058967472640.

The previous prime is 77770505021389. The next prime is 77770505021459. The reversal of 77770505021427 is 72412050507777.

It is a happy number.

77770505021427 is a `hidden beast` number, since 7 + 7 + 7 + 70 + 50 + 502 + 14 + 2 + 7 = 666.

It is not a de Polignac number, because 77770505021427 - 2¹⁹ = 77770504497139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77770505021467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84759402 + ... + 85672032.

It is an arithmetic number, because the mean of its divisors is an integer number (4842053494460).

Almost surely, 2^{77770505021427} is an apocalyptic number.

77770505021427 is a deficient number, since it is larger than the sum of its proper divisors (38438778845613).

77770505021427 is a wasteful number, since it uses less digits than its factorization.

77770505021427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239163 (or 1239160 counting only the distinct ones).

The product of its (nonzero) digits is 6722800, while the sum is 54.

The spelling of 77770505021427 in words is "seventy-seven trillion, seven hundred seventy billion, five hundred five million, twenty-one thousand, four hundred twenty-seven".