78472338784557 has 4 divisors (see below), whose sum is σ = 104629785046080. Its totient is φ = 52314892523036.

The previous prime is 78472338784549. The next prime is 78472338784639. The reversal of 78472338784557 is 75548783327487.

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 78472338784557 - 2³ = 78472338784549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78472338784507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13078723130757 + ... + 13078723130762.

It is an arithmetic number, because the mean of its divisors is an integer number (26157446261520).

Almost surely, 2^{78472338784557} is an apocalyptic number.

It is an amenable number.

78472338784557 is a deficient number, since it is larger than the sum of its proper divisors (26157446261523).

78472338784557 is a wasteful number, since it uses less digits than its factorization.

78472338784557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26157446261522.

The product of its digits is 8851046400, while the sum is 78.

The spelling of 78472338784557 in words is "seventy-eight trillion, four hundred seventy-two billion, three hundred thirty-eight million, seven hundred eighty-four thousand, five hundred fifty-seven".