78145654187 has 4 divisors (see below), whose sum is σ = 78146252256. Its totient is φ = 78145056120.

The previous prime is 78145654129. The next prime is 78145654217.

78145654187 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 78145654187 - 2³⁶ = 9426177451 is a prime.

It is a super-2 number, since 2×78145654187² (a number of 23 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78145654127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9764 + ... + 395457.

It is an arithmetic number, because the mean of its divisors is an integer number (19536563064).

Almost surely, 2^78145654187 is an apocalyptic number.

78145654187 is a deficient number, since it is larger than the sum of its proper divisors (598069).

78145654187 is a wasteful number, since it uses less digits than its factorization.

78145654187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598068.

The product of its digits is 7526400, while the sum is 56.

The spelling of 78145654187 in words is "seventy-eight billion, one hundred forty-five million, six hundred fifty-four thousand, one hundred eighty-seven".