78148202661013 has 4 divisors (see below), whose sum is σ = 78150183091308. Its totient is φ = 78146222230720.

The previous prime is 78148202661007. The next prime is 78148202661041. The reversal of 78148202661013 is 31016620284187.

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 14538374178084 + 63609828482929 = 3812922^2 + 7975577^2 .

It is a cyclic number.

It is not a de Polignac number, because 78148202661013 - 2³³ = 78139612726421 is a prime.

It is a super-2 number, since 2×78148202661013² (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 (78148202661073) 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, 990155956 + ... + 990234877.

It is an arithmetic number, because the mean of its divisors is an integer number (19537545772827).

Almost surely, 2^{78148202661013} is an apocalyptic number.

It is an amenable number.

78148202661013 is a deficient number, since it is larger than the sum of its proper divisors (1980430295).

78148202661013 is a wasteful number, since it uses less digits than its factorization.

78148202661013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980430294.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 78148202661013 in words is "seventy-eight trillion, one hundred forty-eight billion, two hundred two million, six hundred sixty-one thousand, thirteen".