78218865022201 has 4 divisors (see below), whose sum is σ = 78218916976512. Its totient is φ = 78218813067892.

The previous prime is 78218865022189. The next prime is 78218865022219. The reversal of 78218865022201 is 10222056881287.

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 a cyclic number.

It is not a de Polignac number, because 78218865022201 - 2⁵ = 78218865022169 is a prime.

It is a super-2 number, since 2×78218865022201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78218865022271) 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, 23649325 + ... + 26753098.

It is an arithmetic number, because the mean of its divisors is an integer number (19554729244128).

Almost surely, 2^{78218865022201} is an apocalyptic number.

It is an amenable number.

78218865022201 is a deficient number, since it is larger than the sum of its proper divisors (51954311).

78218865022201 is a wasteful number, since it uses less digits than its factorization.

78218865022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51954310.

The product of its (nonzero) digits is 1720320, while the sum is 52.

The spelling of 78218865022201 in words is "seventy-eight trillion, two hundred eighteen billion, eight hundred sixty-five million, twenty-two thousand, two hundred one".