78222021125 has 16 divisors (see below), whose sum is σ = 97648902000. Its totient is φ = 62559784000.

The previous prime is 78222021121. The next prime is 78222021167. The reversal of 78222021125 is 52112022287.

It is a Cunningham number, because it is equal to 279682²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 78222021124 = 1^2 + 279682^2 .

It is not a de Polignac number, because 78222021125 - 2² = 78222021121 is a prime.

It is a super-2 number, since 2×78222021125² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78222021091 and 78222021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78222021121) 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, 360251 + ... + 534999.

It is an arithmetic number, because the mean of its divisors is an integer number (6103056375).

Almost surely, 2^78222021125 is an apocalyptic number.

It is an amenable number.

78222021125 is a deficient number, since it is larger than the sum of its proper divisors (19426880875).

78222021125 is a wasteful number, since it uses less digits than its factorization.

78222021125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178345 (or 178335 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The spelling of 78222021125 in words is "seventy-eight billion, two hundred twenty-two million, twenty-one thousand, one hundred twenty-five".