78666066744 has 64 divisors (see below), whose sum is σ = 202463452800. Its totient is φ = 25452307584.

The previous prime is 78666066737. The next prime is 78666066761. The reversal of 78666066744 is 44766066687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266359 + ... + 477785.

It is an arithmetic number, because the mean of its divisors is an integer number (3163491450).

Almost surely, 2^78666066744 is an apocalyptic number.

78666066744 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78666066744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101231726400).

78666066744 is an abundant number, since it is smaller than the sum of its proper divisors (123797386056).

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

78666066744 is a wasteful number, since it uses less digits than its factorization.

78666066744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211892 (or 211888 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 60.

The spelling of 78666066744 in words is "seventy-eight billion, six hundred sixty-six million, sixty-six thousand, seven hundred forty-four".