78265813169 has 4 divisors (see below), whose sum is σ = 78745971696. Its totient is φ = 77785654644.

The previous prime is 78265813163. The next prime is 78265813201. The reversal of 78265813169 is 96131856287.

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 not a de Polignac number, because 78265813169 - 2¹² = 78265809073 is a prime.

It is a super-2 number, since 2×78265813169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78265813163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240079019 + ... + 240079344.

It is an arithmetic number, because the mean of its divisors is an integer number (19686492924).

Almost surely, 2^78265813169 is an apocalyptic number.

It is an amenable number.

78265813169 is a deficient number, since it is larger than the sum of its proper divisors (480158527).

78265813169 is a wasteful number, since it uses less digits than its factorization.

78265813169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480158526.

The product of its digits is 4354560, while the sum is 56.

The spelling of 78265813169 in words is "seventy-eight billion, two hundred sixty-five million, eight hundred thirteen thousand, one hundred sixty-nine".