78833943021 has 4 divisors (see below), whose sum is σ = 105111924032. Its totient is φ = 52555962012.

The previous prime is 78833942953. The next prime is 78833943031. The reversal of 78833943021 is 12034933887.

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 not a de Polignac number, because 78833943021 - 2⁷ = 78833942893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78833943031) 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, 13138990501 + ... + 13138990506.

It is an arithmetic number, because the mean of its divisors is an integer number (26277981008).

Almost surely, 2^78833943021 is an apocalyptic number.

It is an amenable number.

78833943021 is a deficient number, since it is larger than the sum of its proper divisors (26277981011).

78833943021 is a wasteful number, since it uses less digits than its factorization.

78833943021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26277981010.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 78833943021 in words is "seventy-eight billion, eight hundred thirty-three million, nine hundred forty-three thousand, twenty-one".