78351313081 has 4 divisors (see below), whose sum is σ = 78367699072. Its totient is φ = 78334927092.

The previous prime is 78351313057. The next prime is 78351313127. The reversal of 78351313081 is 18031315387.

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 a cyclic number.

It is not a de Polignac number, because 78351313081 - 2⁵ = 78351313049 is a prime.

It is a super-2 number, since 2×78351313081² (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 (78351313031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8185821 + ... + 8195386.

It is an arithmetic number, because the mean of its divisors is an integer number (19591924768).

Almost surely, 2^78351313081 is an apocalyptic number.

It is an amenable number.

78351313081 is a deficient number, since it is larger than the sum of its proper divisors (16385991).

78351313081 is a wasteful number, since it uses less digits than its factorization.

78351313081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16385990.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 78351313081 in words is "seventy-eight billion, three hundred fifty-one million, three hundred thirteen thousand, eighty-one".