78642816241 has 4 divisors (see below), whose sum is σ = 85792163184. Its totient is φ = 71493469300.

The previous prime is 78642816199. The next prime is 78642816247. The reversal of 78642816241 is 14261824687.

It is a happy number.

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 78642816241 - 2²³ = 78634427633 is a prime.

It is a super-3 number, since 3×78642816241³ (a number of 34 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78642816247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3574673455 + ... + 3574673476.

It is an arithmetic number, because the mean of its divisors is an integer number (21448040796).

Almost surely, 2^78642816241 is an apocalyptic number.

It is an amenable number.

78642816241 is a deficient number, since it is larger than the sum of its proper divisors (7149346943).

78642816241 is a wasteful number, since it uses less digits than its factorization.

78642816241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7149346942.

The product of its digits is 1032192, while the sum is 49.

The spelling of 78642816241 in words is "seventy-eight billion, six hundred forty-two million, eight hundred sixteen thousand, two hundred forty-one".