78855465603601 has 4 divisors (see below), whose sum is σ = 79291131159604. Its totient is φ = 78419800047600.

The previous prime is 78855465603511. The next prime is 78855465603647. The reversal of 78855465603601 is 10630656455887.

It is a happy number.

It is a Cunningham number, because it is equal to 8880060²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 868922265600 + 77986543338001 = 932160^2 + 8830999^2 .

It is a cyclic number.

It is not a de Polignac number, because 78855465603601 - 2¹³ = 78855465595409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78855465606601) 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, 217832777730 + ... + 217832778091.

It is an arithmetic number, because the mean of its divisors is an integer number (19822782789901).

Almost surely, 2^{78855465603601} is an apocalyptic number.

It is an amenable number.

78855465603601 is a deficient number, since it is larger than the sum of its proper divisors (435665556003).

78855465603601 is a wasteful number, since it uses less digits than its factorization.

78855465603601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435665556002.

The product of its (nonzero) digits is 145152000, while the sum is 64.

The spelling of 78855465603601 in words is "seventy-eight trillion, eight hundred fifty-five billion, four hundred sixty-five million, six hundred three thousand, six hundred one".