77392079081 has 4 divisors (see below), whose sum is σ = 79483756932. Its totient is φ = 75300401232.

The previous prime is 77392079077. The next prime is 77392079087. The reversal of 77392079081 is 18097029377.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73799155600 + 3592923481 = 271660^2 + 59941^2 .

It is a cyclic number.

It is not a de Polignac number, because 77392079081 - 2² = 77392079077 is a prime.

It is a super-2 number, since 2×77392079081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77392079087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1045838870 + ... + 1045838943.

It is an arithmetic number, because the mean of its divisors is an integer number (19870939233).

Almost surely, 2^77392079081 is an apocalyptic number.

It is an amenable number.

77392079081 is a deficient number, since it is larger than the sum of its proper divisors (2091677851).

77392079081 is a wasteful number, since it uses less digits than its factorization.

77392079081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091677850.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 77392079081 in words is "seventy-seven billion, three hundred ninety-two million, seventy-nine thousand, eighty-one".