78166273578 has 16 divisors (see below), whose sum is σ = 157328297760. Its totient is φ = 25889466096.

The previous prime is 78166273573. The next prime is 78166273589. The reversal of 78166273578 is 87537266187.

It is a happy number.

It is a super-3 number, since 3×78166273578³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (78166273573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41488588 + ... + 41490471.

It is an arithmetic number, because the mean of its divisors is an integer number (9833018610).

Almost surely, 2^78166273578 is an apocalyptic number.

78166273578 is an abundant number, since it is smaller than the sum of its proper divisors (79162024182).

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

78166273578 is a wasteful number, since it uses less digits than its factorization.

78166273578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82979221.

The product of its digits is 23708160, while the sum is 60.

The spelling of 78166273578 in words is "seventy-eight billion, one hundred sixty-six million, two hundred seventy-three thousand, five hundred seventy-eight".