78785191469 has 2 divisors, whose sum is σ = 78785191470. Its totient is φ = 78785191468.

The previous prime is 78785191451. The next prime is 78785191543. The reversal of 78785191469 is 96419158787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68877378025 + 9907813444 = 262445^2 + 99538^2 .

It is a cyclic number.

It is not a de Polignac number, because 78785191469 - 2⁸ = 78785191213 is a prime.

It is a super-2 number, since 2×78785191469² (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 (78785193469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39392595734 + 39392595735.

It is an arithmetic number, because the mean of its divisors is an integer number (39392595735).

Almost surely, 2^78785191469 is an apocalyptic number.

It is an amenable number.

78785191469 is a deficient number, since it is larger than the sum of its proper divisors (1).

78785191469 is an equidigital number, since it uses as much as digits as its factorization.

78785191469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 65.

The spelling of 78785191469 in words is "seventy-eight billion, seven hundred eighty-five million, one hundred ninety-one thousand, four hundred sixty-nine".