78675685441 has 4 divisors (see below), whose sum is σ = 78677170884. Its totient is φ = 78674200000.

The previous prime is 78675685433. The next prime is 78675685489. The reversal of 78675685441 is 14458657687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43982897841 + 34692787600 = 209721^2 + 186260^2 .

It is a cyclic number.

It is not a de Polignac number, because 78675685441 - 2³ = 78675685433 is a prime.

It is a super-2 number, since 2×78675685441² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78675685441.

It is not an unprimeable number, because it can be changed into a prime (78675682441) 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, 660220 + ... + 770221.

It is an arithmetic number, because the mean of its divisors is an integer number (19669292721).

Almost surely, 2^78675685441 is an apocalyptic number.

It is an amenable number.

78675685441 is a deficient number, since it is larger than the sum of its proper divisors (1485443).

78675685441 is a wasteful number, since it uses less digits than its factorization.

78675685441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485442.

The product of its digits is 45158400, while the sum is 61.

The spelling of 78675685441 in words is "seventy-eight billion, six hundred seventy-five million, six hundred eighty-five thousand, four hundred forty-one".