78536764433 has 2 divisors, whose sum is σ = 78536764434. Its totient is φ = 78536764432.

The previous prime is 78536764417. The next prime is 78536764447. The reversal of 78536764433 is 33446763587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52017293329 + 26519471104 = 228073^2 + 162848^2 .

It is a cyclic number.

It is not a de Polignac number, because 78536764433 - 2⁴ = 78536764417 is a prime.

It is a super-2 number, since 2×78536764433² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78536754433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39268382216 + 39268382217.

It is an arithmetic number, because the mean of its divisors is an integer number (39268382217).

Almost surely, 2^78536764433 is an apocalyptic number.

It is an amenable number.

78536764433 is a deficient number, since it is larger than the sum of its proper divisors (1).

78536764433 is an equidigital number, since it uses as much as digits as its factorization.

78536764433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 56.

The spelling of 78536764433 in words is "seventy-eight billion, five hundred thirty-six million, seven hundred sixty-four thousand, four hundred thirty-three".