79877788777897 has 16 divisors (see below), whose sum is σ = 88848494289792. Its totient is φ = 71193935912320.

The previous prime is 79877788777889. The next prime is 79877788777999.

79877788777897 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 79877788777897 - 2³ = 79877788777889 is a prime.

It is a super-2 number, since 2×79877788777897² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79877788777897.

It is not an unprimeable number, because it can be changed into a prime (79877788777807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49317028 + ... + 50910949.

It is an arithmetic number, because the mean of its divisors is an integer number (5553030893112).

Almost surely, 2^{79877788777897} is an apocalyptic number.

It is an amenable number.

79877788777897 is a deficient number, since it is larger than the sum of its proper divisors (8970705511895).

79877788777897 is a wasteful number, since it uses less digits than its factorization.

79877788777897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100229408.

The product of its digits is 1912622616576, while the sum is 106.

The spelling of 79877788777897 in words is "seventy-nine trillion, eight hundred seventy-seven billion, seven hundred eighty-eight million, seven hundred seventy-seven thousand, eight hundred ninety-seven".