78349945079 has 12 divisors (see below), whose sum is σ = 91203815808. Its totient is φ = 67111380000.

The previous prime is 78349945067. The next prime is 78349945129. The reversal of 78349945079 is 97054994387.

It is a de Polignac number, because none of the positive numbers 2^k-78349945079 is a prime.

It is a super-2 number, since 2×78349945079² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78345945079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471422 + ... + 615579.

It is an arithmetic number, because the mean of its divisors is an integer number (7600317984).

Almost surely, 2^78349945079 is an apocalyptic number.

78349945079 is a deficient number, since it is larger than the sum of its proper divisors (12853870729).

78349945079 is a wasteful number, since it uses less digits than its factorization.

78349945079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088486 (or 1088479 counting only the distinct ones).

The product of its (nonzero) digits is 68584320, while the sum is 65.

The spelling of 78349945079 in words is "seventy-eight billion, three hundred forty-nine million, nine hundred forty-five thousand, seventy-nine".