78166121883355 has 32 divisors (see below), whose sum is σ = 104707427489280. Its totient is φ = 55525414049280.

The previous prime is 78166121883341. The next prime is 78166121883383. The reversal of 78166121883355 is 55338812166187.

It is not a de Polignac number, because 78166121883355 - 2¹⁵ = 78166121850587 is a prime.

It is a super-2 number, since 2×78166121883355² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344095651 + ... + 344322739.

It is an arithmetic number, because the mean of its divisors is an integer number (3272107109040).

Almost surely, 2^{78166121883355} is an apocalyptic number.

78166121883355 is a deficient number, since it is larger than the sum of its proper divisors (26541305605925).

78166121883355 is a wasteful number, since it uses less digits than its factorization.

78166121883355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372691.

The product of its digits is 58060800, while the sum is 64.

The spelling of 78166121883355 in words is "seventy-eight trillion, one hundred sixty-six billion, one hundred twenty-one million, eight hundred eighty-three thousand, three hundred fifty-five".