78321455547 has 4 divisors (see below), whose sum is σ = 104428607400. Its totient is φ = 52214303696.

The previous prime is 78321455539. The next prime is 78321455581. The reversal of 78321455547 is 74555412387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78321455547 - 2³ = 78321455539 is a prime.

It is a super-2 number, since 2×78321455547² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78321455547.

It is not an unprimeable number, because it can be changed into a prime (78321456547) 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, 13053575922 + ... + 13053575927.

It is an arithmetic number, because the mean of its divisors is an integer number (26107151850).

Almost surely, 2^78321455547 is an apocalyptic number.

78321455547 is a deficient number, since it is larger than the sum of its proper divisors (26107151853).

78321455547 is a wasteful number, since it uses less digits than its factorization.

78321455547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26107151852.

The product of its digits is 4704000, while the sum is 51.

The spelling of 78321455547 in words is "seventy-eight billion, three hundred twenty-one million, four hundred fifty-five thousand, five hundred forty-seven".