78454133145487 has 4 divisors (see below), whose sum is σ = 85586327067816. Its totient is φ = 71321939223160.

The previous prime is 78454133145361. The next prime is 78454133145523.

78454133145487 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 78454133145487 - 2⁷ = 78454133145359 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 (78454133245487) 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, 3566096961148 + ... + 3566096961169.

It is an arithmetic number, because the mean of its divisors is an integer number (21396581766954).

Almost surely, 2^{78454133145487} is an apocalyptic number.

78454133145487 is a deficient number, since it is larger than the sum of its proper divisors (7132193922329).

78454133145487 is a wasteful number, since it uses less digits than its factorization.

78454133145487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7132193922328.

The product of its digits is 180633600, while the sum is 64.

The spelling of 78454133145487 in words is "seventy-eight trillion, four hundred fifty-four billion, one hundred thirty-three million, one hundred forty-five thousand, four hundred eighty-seven".