78750420450009 has 16 divisors (see below), whose sum is σ = 130909789839360. Its totient is φ = 40909309324560.

The previous prime is 78750420449947. The next prime is 78750420450029. The reversal of 78750420450009 is 90005402405787.

It is a happy number.

It is not a de Polignac number, because 78750420450009 - 2⁷ = 78750420449881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78750420450029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170455455289 + ... + 170455455750.

It is an arithmetic number, because the mean of its divisors is an integer number (8181861864960).

Almost surely, 2^{78750420450009} is an apocalyptic number.

It is an amenable number.

78750420450009 is a deficient number, since it is larger than the sum of its proper divisors (52159369389351).

78750420450009 is a wasteful number, since it uses less digits than its factorization.

78750420450009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340910911060.

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 78750420450009 in words is "seventy-eight trillion, seven hundred fifty billion, four hundred twenty million, four hundred fifty thousand, nine".