78222175261 has 2 divisors, whose sum is σ = 78222175262. Its totient is φ = 78222175260.

The previous prime is 78222175219. The next prime is 78222175277. The reversal of 78222175261 is 16257122287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64259208036 + 13962967225 = 253494^2 + 118165^2 .

It is a cyclic number.

It is not a de Polignac number, because 78222175261 - 2¹⁹ = 78221650973 is a prime.

It is a super-2 number, since 2×78222175261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78222175061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39111087630 + 39111087631.

It is an arithmetic number, because the mean of its divisors is an integer number (39111087631).

Almost surely, 2^78222175261 is an apocalyptic number.

It is an amenable number.

78222175261 is a deficient number, since it is larger than the sum of its proper divisors (1).

78222175261 is an equidigital number, since it uses as much as digits as its factorization.

78222175261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The spelling of 78222175261 in words is "seventy-eight billion, two hundred twenty-two million, one hundred seventy-five thousand, two hundred sixty-one".