78353940071 has 4 divisors (see below), whose sum is σ = 85477025544. Its totient is φ = 71230854600.

The previous prime is 78353940059. The next prime is 78353940073. The reversal of 78353940071 is 17004935387.

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

It is a cyclic number.

It is not a de Polignac number, because 78353940071 - 2²² = 78349745767 is a prime.

It is a super-2 number, since 2×78353940071² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78353939998 and 78353940025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78353940073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3561542720 + ... + 3561542741.

It is an arithmetic number, because the mean of its divisors is an integer number (21369256386).

Almost surely, 2^78353940071 is an apocalyptic number.

78353940071 is a deficient number, since it is larger than the sum of its proper divisors (7123085473).

78353940071 is a wasteful number, since it uses less digits than its factorization.

78353940071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7123085472.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 78353940071 in words is "seventy-eight billion, three hundred fifty-three million, nine hundred forty thousand, seventy-one".