78311778443 has 8 divisors (see below), whose sum is σ = 79368620256. Its totient is φ = 77260456000.

The previous prime is 78311778439. The next prime is 78311778463. The reversal of 78311778443 is 34487711387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78311778443 - 2² = 78311778439 is a prime.

It is a super-2 number, since 2×78311778443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78311778463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351271 + ... + 1408032.

It is an arithmetic number, because the mean of its divisors is an integer number (9921077532).

Almost surely, 2^78311778443 is an apocalyptic number.

78311778443 is a deficient number, since it is larger than the sum of its proper divisors (1056841813).

78311778443 is a wasteful number, since it uses less digits than its factorization.

78311778443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759685.

The product of its digits is 3161088, while the sum is 53.

The spelling of 78311778443 in words is "seventy-eight billion, three hundred eleven million, seven hundred seventy-eight thousand, four hundred forty-three".