78242512252447 has 4 divisors (see below), whose sum is σ = 78385551580696. Its totient is φ = 78099472924200.

The previous prime is 78242512252409. The next prime is 78242512252517. The reversal of 78242512252447 is 74425221524287.

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 78242512252447 - 2⁴³ = 69446419230239 is a prime.

It is a super-2 number, since 2×78242512252447² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78242512259447) 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, 71519663304 + ... + 71519664397.

It is an arithmetic number, because the mean of its divisors is an integer number (19596387895174).

Almost surely, 2^{78242512252447} is an apocalyptic number.

78242512252447 is a deficient number, since it is larger than the sum of its proper divisors (143039328249).

78242512252447 is a wasteful number, since it uses less digits than its factorization.

78242512252447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143039328248.

The product of its digits is 20070400, while the sum is 55.

The spelling of 78242512252447 in words is "seventy-eight trillion, two hundred forty-two billion, five hundred twelve million, two hundred fifty-two thousand, four hundred forty-seven".