78693443481 has 4 divisors (see below), whose sum is σ = 104924591312. Its totient is φ = 52462295652.

The previous prime is 78693443471. The next prime is 78693443497. The reversal of 78693443481 is 18434439687.

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 78693443481 - 2¹¹ = 78693441433 is a prime.

It is a super-2 number, since 2×78693443481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78693443441) 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, 13115573911 + ... + 13115573916.

It is an arithmetic number, because the mean of its divisors is an integer number (26231147828).

Almost surely, 2^78693443481 is an apocalyptic number.

It is an amenable number.

78693443481 is a deficient number, since it is larger than the sum of its proper divisors (26231147831).

78693443481 is a wasteful number, since it uses less digits than its factorization.

78693443481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26231147830.

The product of its digits is 13934592, while the sum is 57.

The spelling of 78693443481 in words is "seventy-eight billion, six hundred ninety-three million, four hundred forty-three thousand, four hundred eighty-one".