78433440218697 has 4 divisors (see below), whose sum is σ = 104577920291600. Its totient is φ = 52288960145796.

The previous prime is 78433440218689. The next prime is 78433440218701. The reversal of 78433440218697 is 79681204433487.

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 not a de Polignac number, because 78433440218697 - 2³ = 78433440218689 is a prime.

It is a super-2 number, since 2×78433440218697² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78433440218647) 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, 13072240036447 + ... + 13072240036452.

It is an arithmetic number, because the mean of its divisors is an integer number (26144480072900).

Almost surely, 2^{78433440218697} is an apocalyptic number.

It is an amenable number.

78433440218697 is a deficient number, since it is larger than the sum of its proper divisors (26144480072903).

78433440218697 is a wasteful number, since it uses less digits than its factorization.

78433440218697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26144480072902.

The product of its (nonzero) digits is 195084288, while the sum is 66.

The spelling of 78433440218697 in words is "seventy-eight trillion, four hundred thirty-three billion, four hundred forty million, two hundred eighteen thousand, six hundred ninety-seven".