78666364026 has 128 divisors (see below), whose sum is σ = 192148070400. Its totient is φ = 23748560640.

The previous prime is 78666364019. The next prime is 78666364027. The reversal of 78666364026 is 62046366687.

It is a super-2 number, since 2×78666364026² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78666364027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5086261 + ... + 5101703.

It is an arithmetic number, because the mean of its divisors is an integer number (1501156800).

Almost surely, 2^78666364026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78666364026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96074035200).

78666364026 is an abundant number, since it is smaller than the sum of its proper divisors (113481706374).

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

78666364026 is a wasteful number, since it uses less digits than its factorization.

78666364026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15681 (or 15675 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 54.

The spelling of 78666364026 in words is "seventy-eight billion, six hundred sixty-six million, three hundred sixty-four thousand, twenty-six".