78227255188215 has 96 divisors (see below), whose sum is σ = 157197262485120. Its totient is φ = 35246456598528.

The previous prime is 78227255188213. The next prime is 78227255188237. The reversal of 78227255188215 is 51288155272287.

It is a happy number.

78227255188215 is a `hidden beast` number, since 7 + 8 + 2 + 2 + 7 + 25 + 518 + 82 + 15 = 666.

It is not a de Polignac number, because 78227255188215 - 2¹ = 78227255188213 is a prime.

It is a super-2 number, since 2×78227255188215² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78227255188213) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31669539 + ... + 34050171.

It is an arithmetic number, because the mean of its divisors is an integer number (1637471484220).

Almost surely, 2^{78227255188215} is an apocalyptic number.

78227255188215 is an abundant number, since it is smaller than the sum of its proper divisors (78970007296905).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78227255188215 is a wasteful number, since it uses less digits than its factorization.

78227255188215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382153 (or 2382150 counting only the distinct ones).

The product of its digits is 50176000, while the sum is 63.

The spelling of 78227255188215 in words is "seventy-eight trillion, two hundred twenty-seven billion, two hundred fifty-five million, one hundred eighty-eight thousand, two hundred fifteen".