78353211771 has 12 divisors (see below), whose sum is σ = 113256080080. Its totient is φ = 52198912080.

The previous prime is 78353211767. The next prime is 78353211779. The reversal of 78353211771 is 17711235387.

It is not a de Polignac number, because 78353211771 - 2² = 78353211767 is a prime.

It is a super-2 number, since 2×78353211771² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78353211779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3033295 + ... + 3059016.

Almost surely, 2^78353211771 is an apocalyptic number.

78353211771 is a deficient number, since it is larger than the sum of its proper divisors (34902868309).

78353211771 is a wasteful number, since it uses less digits than its factorization.

78353211771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6093746 (or 6093743 counting only the distinct ones).

The product of its digits is 246960, while the sum is 45.

The spelling of 78353211771 in words is "seventy-eight billion, three hundred fifty-three million, two hundred eleven thousand, seven hundred seventy-one".