778785023101 has 48 divisors (see below), whose sum is σ = 850078152000. Its totient is φ = 712167348480.

The previous prime is 778785023047. The next prime is 778785023111. The reversal of 778785023101 is 101320587877.

It is a de Polignac number, because none of the positive numbers 2^k-778785023101 is a prime.

It is a super-2 number, since 2×778785023101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778785023111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 393523530 + ... + 393525508.

It is an arithmetic number, because the mean of its divisors is an integer number (17709961500).

Almost surely, 2^778785023101 is an apocalyptic number.

It is an amenable number.

778785023101 is a deficient number, since it is larger than the sum of its proper divisors (71293128899).

778785023101 is a wasteful number, since it uses less digits than its factorization.

778785023101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2314 (or 2271 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 49.

The spelling of 778785023101 in words is "seven hundred seventy-eight billion, seven hundred eighty-five million, twenty-three thousand, one hundred one".