78022120081 has 2 divisors, whose sum is σ = 78022120082. Its totient is φ = 78022120080.

The previous prime is 78022120079. The next prime is 78022120129. The reversal of 78022120081 is 18002122087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57341091600 + 20681028481 = 239460^2 + 143809^2 .

It is a cyclic number.

It is not a de Polignac number, because 78022120081 - 2¹ = 78022120079 is a prime.

It is a super-2 number, since 2×78022120081² (a number of 23 digits) contains 22 as substring.

Together with 78022120079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78022120021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39011060040 + 39011060041.

It is an arithmetic number, because the mean of its divisors is an integer number (39011060041).

Almost surely, 2^78022120081 is an apocalyptic number.

It is an amenable number.

78022120081 is a deficient number, since it is larger than the sum of its proper divisors (1).

78022120081 is an equidigital number, since it uses as much as digits as its factorization.

78022120081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The spelling of 78022120081 in words is "seventy-eight billion, twenty-two million, one hundred twenty thousand, eighty-one".