78233439533 has 2 divisors, whose sum is σ = 78233439534. Its totient is φ = 78233439532.

The previous prime is 78233439523. The next prime is 78233439541. The reversal of 78233439533 is 33593433287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60903823369 + 17329616164 = 246787^2 + 131642^2 .

It is a cyclic number.

It is not a de Polignac number, because 78233439533 - 2⁴ = 78233439517 is a prime.

It is a super-2 number, since 2×78233439533² (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 (78233439523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39116719766 + 39116719767.

It is an arithmetic number, because the mean of its divisors is an integer number (39116719767).

Almost surely, 2^78233439533 is an apocalyptic number.

It is an amenable number.

78233439533 is a deficient number, since it is larger than the sum of its proper divisors (1).

78233439533 is an equidigital number, since it uses as much as digits as its factorization.

78233439533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 50.

The spelling of 78233439533 in words is "seventy-eight billion, two hundred thirty-three million, four hundred thirty-nine thousand, five hundred thirty-three".