78251304311081 has 4 divisors (see below), whose sum is σ = 85365059248464. Its totient is φ = 71137549373700.

The previous prime is 78251304311057. The next prime is 78251304311093. The reversal of 78251304311081 is 18011340315287.

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 78251304311081 - 2⁴⁶ = 7882560133417 is a prime.

It is a super-3 number, since 3×78251304311081³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78251304311881) 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, 3556877468675 + ... + 3556877468696.

It is an arithmetic number, because the mean of its divisors is an integer number (21341264812116).

Almost surely, 2^{78251304311081} is an apocalyptic number.

It is an amenable number.

78251304311081 is a deficient number, since it is larger than the sum of its proper divisors (7113754937383).

78251304311081 is a wasteful number, since it uses less digits than its factorization.

78251304311081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7113754937382.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 78251304311081 in words is "seventy-eight trillion, two hundred fifty-one billion, three hundred four million, three hundred eleven thousand, eighty-one".