78133265773 has 2 divisors, whose sum is σ = 78133265774. Its totient is φ = 78133265772.

The previous prime is 78133265729. The next prime is 78133265813. The reversal of 78133265773 is 37756233187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66521694724 + 11611571049 = 257918^2 + 107757^2 .

It is an emirp because it is prime and its reverse (37756233187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78133265773 - 2¹⁷ = 78133134701 is a prime.

It is a super-2 number, since 2×78133265773² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78133265773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78133265473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39066632886 + 39066632887.

It is an arithmetic number, because the mean of its divisors is an integer number (39066632887).

Almost surely, 2^78133265773 is an apocalyptic number.

It is an amenable number.

78133265773 is a deficient number, since it is larger than the sum of its proper divisors (1).

78133265773 is an equidigital number, since it uses as much as digits as its factorization.

78133265773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 52.

The spelling of 78133265773 in words is "seventy-eight billion, one hundred thirty-three million, two hundred sixty-five thousand, seven hundred seventy-three".