78021402170427 has 12 divisors (see below), whose sum is σ = 115446302399064. Its totient is φ = 50745627427680.

The previous prime is 78021402170363. The next prime is 78021402170429. The reversal of 78021402170427 is 72407120412087.

78021402170427 is a `hidden beast` number, since 7 + 8 + 0 + 2 + 1 + 4 + 0 + 217 + 0 + 427 = 666.

It is not a de Polignac number, because 78021402170427 - 2⁶ = 78021402170363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78021402170429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105720056773 + ... + 105720057510.

It is an arithmetic number, because the mean of its divisors is an integer number (9620525199922).

Almost surely, 2^{78021402170427} is an apocalyptic number.

78021402170427 is a deficient number, since it is larger than the sum of its proper divisors (37424900228637).

78021402170427 is a wasteful number, since it uses less digits than its factorization.

78021402170427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211440114330 (or 211440114327 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The spelling of 78021402170427 in words is "seventy-eight trillion, twenty-one billion, four hundred two million, one hundred seventy thousand, four hundred twenty-seven".