78124319697 has 4 divisors (see below), whose sum is σ = 104165759600. Its totient is φ = 52082879796.

The previous prime is 78124319687. The next prime is 78124319729. The reversal of 78124319697 is 79691342187.

It is a happy number.

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 78124319697 - 2¹⁰ = 78124318673 is a prime.

It is a super-2 number, since 2×78124319697² (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 (78124319687) 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, 13020719947 + ... + 13020719952.

It is an arithmetic number, because the mean of its divisors is an integer number (26041439900).

Almost surely, 2^78124319697 is an apocalyptic number.

It is an amenable number.

78124319697 is a deficient number, since it is larger than the sum of its proper divisors (26041439903).

78124319697 is a wasteful number, since it uses less digits than its factorization.

78124319697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26041439902.

The product of its digits is 4572288, while the sum is 57.

The spelling of 78124319697 in words is "seventy-eight billion, one hundred twenty-four million, three hundred nineteen thousand, six hundred ninety-seven".