78450559769 has 4 divisors (see below), whose sum is σ = 81861453696. Its totient is φ = 75039665844.

The previous prime is 78450559741. The next prime is 78450559783. The reversal of 78450559769 is 96795505487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78450559769 is a prime.

It is a super-2 number, since 2×78450559769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78450559739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1705446929 + ... + 1705446974.

It is an arithmetic number, because the mean of its divisors is an integer number (20465363424).

Almost surely, 2^78450559769 is an apocalyptic number.

It is an amenable number.

78450559769 is a deficient number, since it is larger than the sum of its proper divisors (3410893927).

78450559769 is a wasteful number, since it uses less digits than its factorization.

78450559769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410893926.

The product of its (nonzero) digits is 95256000, while the sum is 65.

The spelling of 78450559769 in words is "seventy-eight billion, four hundred fifty million, five hundred fifty-nine thousand, seven hundred sixty-nine".