78105683658493 has 4 divisors (see below), whose sum is σ = 78109962736828. Its totient is φ = 78101404580160.

The previous prime is 78105683658463. The next prime is 78105683658551. The reversal of 78105683658493 is 39485638650187.

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 35078932026009 + 43026751632484 = 5922747^2 + 6559478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78105683658493 is a prime.

It is a super-2 number, since 2×78105683658493² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78105683658463) 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, 2139511788 + ... + 2139548293.

It is an arithmetic number, because the mean of its divisors is an integer number (19527490684207).

Almost surely, 2^{78105683658493} is an apocalyptic number.

It is an amenable number.

78105683658493 is a deficient number, since it is larger than the sum of its proper divisors (4279078335).

78105683658493 is a wasteful number, since it uses less digits than its factorization.

78105683658493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279078334.

The product of its (nonzero) digits is 1045094400, while the sum is 73.

The spelling of 78105683658493 in words is "seventy-eight trillion, one hundred five billion, six hundred eighty-three million, six hundred fifty-eight thousand, four hundred ninety-three".