78021402170355 has 128 divisors (see below), whose sum is σ = 169069507061760. Its totient is φ = 33323842990080.

The previous prime is 78021402170339. The next prime is 78021402170363. The reversal of 78021402170355 is 55307120412087.

78021402170355 is a `hidden beast` number, since 7 + 8 + 0 + 21 + 402 + 170 + 3 + 55 = 666.

It is not a de Polignac number, because 78021402170355 - 2⁴ = 78021402170339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78021402170355.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 15523941 + ... + 19925750.

It is an arithmetic number, because the mean of its divisors is an integer number (1320855523920).

Almost surely, 2^{78021402170355} is an apocalyptic number.

78021402170355 is an abundant number, since it is smaller than the sum of its proper divisors (91048104891405).

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

78021402170355 is a wasteful number, since it uses less digits than its factorization.

78021402170355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35449866 (or 35449860 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 78021402170355 in words is "seventy-eight trillion, twenty-one billion, four hundred two million, one hundred seventy thousand, three hundred fifty-five".