78445591249 has 8 divisors (see below), whose sum is σ = 78964860800. Its totient is φ = 77927572800.

The previous prime is 78445591247. The next prime is 78445591253. The reversal of 78445591249 is 94219554487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78445591249 - 2¹ = 78445591247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78445591193 and 78445591202.

It is not an unprimeable number, because it can be changed into a prime (78445591241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186792 + ... + 437929.

It is an arithmetic number, because the mean of its divisors is an integer number (9870607600).

Almost surely, 2^78445591249 is an apocalyptic number.

It is an amenable number.

78445591249 is a deficient number, since it is larger than the sum of its proper divisors (519269551).

78445591249 is a wasteful number, since it uses less digits than its factorization.

78445591249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625551.

The product of its digits is 14515200, while the sum is 58.

The spelling of 78445591249 in words is "seventy-eight billion, four hundred forty-five million, five hundred ninety-one thousand, two hundred forty-nine".