78349568446 has 4 divisors (see below), whose sum is σ = 117524352672. Its totient is φ = 39174784222.

The previous prime is 78349568413. The next prime is 78349568477. The reversal of 78349568446 is 64486594387.

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

It is a super-2 number, since 2×78349568446² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19587392110 + ... + 19587392113.

It is an arithmetic number, because the mean of its divisors is an integer number (29381088168).

Almost surely, 2^78349568446 is an apocalyptic number.

78349568446 is a deficient number, since it is larger than the sum of its proper divisors (39174784226).

78349568446 is a wasteful number, since it uses less digits than its factorization.

78349568446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39174784225.

The product of its digits is 139345920, while the sum is 64.

The spelling of 78349568446 in words is "seventy-eight billion, three hundred forty-nine million, five hundred sixty-eight thousand, four hundred forty-six".