320666157757616 has 80 divisors (see below), whose sum is σ = 696143089838880. Its totient is φ = 141807100631040.

The previous prime is 320666157757607. The next prime is 320666157757639. The reversal of 320666157757616 is 616757751666023.

It is a happy 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, 83487620 + ... + 87243996.

It is an arithmetic number, because the mean of its divisors is an integer number (8701788622986).

Almost surely, 2^{320666157757616} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320666157757616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348071544919440).

320666157757616 is an abundant number, since it is smaller than the sum of its proper divisors (375476932081264).

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

320666157757616 is a wasteful number, since it uses less digits than its factorization.

320666157757616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3769542 (or 3769536 counting only the distinct ones).

The product of its (nonzero) digits is 400075200, while the sum is 68.

The spelling of 320666157757616 in words is "three hundred twenty trillion, six hundred sixty-six billion, one hundred fifty-seven million, seven hundred fifty-seven thousand, six hundred sixteen".