78242599345 has 4 divisors (see below), whose sum is σ = 93891119220. Its totient is φ = 62594079472.

The previous prime is 78242599333. The next prime is 78242599411. The reversal of 78242599345 is 54399524287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54399524287 = 1249 ⋅43554463.

It can be written as a sum of positive squares in 2 ways, for example, as 8806133281 + 69436466064 = 93841^2 + 263508^2 .

It is a cyclic number.

It is not a de Polignac number, because 78242599345 - 2⁵ = 78242599313 is a prime.

It is a super-2 number, since 2×78242599345² (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 78242599345.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7824259930 + ... + 7824259939.

It is an arithmetic number, because the mean of its divisors is an integer number (23472779805).

Almost surely, 2^78242599345 is an apocalyptic number.

It is an amenable number.

78242599345 is a deficient number, since it is larger than the sum of its proper divisors (15648519875).

78242599345 is a wasteful number, since it uses less digits than its factorization.

78242599345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15648519874.

The product of its digits is 21772800, while the sum is 58.

The spelling of 78242599345 in words is "seventy-eight billion, two hundred forty-two million, five hundred ninety-nine thousand, three hundred forty-five".